Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adf828cf01b27f2…

MALICIOUS

PDF

92.0 KB Created: 2021-08-23 18:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7773dd4a6ef13479bb5aafd42c17393f SHA-1: 70e467167e63676b71af09b6d1527e1ead1c1b34 SHA-256: 6adf828cf01b27f2b6a2fbc6e41daddc251a6c15e04491ce8c2cdc527be14967
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of a 'download button' lure and callback phishing pretext further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cosmoscm.com/contents//files/24211914863.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/23283552105.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/93619151169.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/luzilo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95be03e2e---63941944213.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dotit.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/lagawewawojipoxolu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/monoripaduxozinoj.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/dovititivariwewazoluteb.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca6eb224e---sefowixifivubavuzu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/77322684640.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/37475731056.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cc2180c71c36a2ff514c57014e04b06c/kabenenetewuvuletiw.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/90665652848.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608212efd83a8---xenivepunesifofa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3ab8576a4317666e668f53a721234521/zuzakozuvumonuxikozowepun.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c423ff67926---13932489175.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210717/file/2676853681.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160758714807b1---sasasuwesa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe17cb7b0---tibetijuloworekav.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/supinologedafuxefi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0948094b3---zexixavililakur.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/97228239598.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/p7q49cdijt1itibvkqf8v3fqja/43775587575.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/74352075859.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5c070b32e4a92a044a4377f2e0970b1b/vabowonilewegin.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/70666175542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2013+icas+english+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10744 bytes
SHA-256: eb9519836d47ecd0c2a77fdd345816b34ebe55dc89aaa81ef74376231a8bb69f
font_01_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16956 bytes
SHA-256: 662511d62894db8405d69f9781feb4ef752124ca88a8f161c8659ef5606f13e9
font_02_sfnt_off000149f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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