Malicious PDF — malware analysis report

Static analysis result for SHA-256 611c12a91611b682…

MALICIOUS

PDF

75.1 KB Created: 2021-09-11 06:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5738f411934990c5429c898df7d81f4c SHA-1: 0900c2a9a983a8087b1cd03cab806104eae0aef0 SHA-256: 611c12a91611b682b19ff326569149962676bf3b4a4bb3ce7b8629e2e3c5c701
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic firings related to link farms and compromised CMS uploads support the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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 https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161387b421dac9---zapibadojowabedape.pdf In PDF document text
    • http://autoscuolecasetta.it/userfiles/files/49920318299.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/jumapodidumuliratovipevop.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/37232421369.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/lifewuriberufiluniwotogow.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/94c91a43820e1425b85fa83ed4cd9ed8/wudenesil.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/mamevinetuz.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef638df0f---lofovinigamup.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161373771eb2dc---59753164237.pdfIn PDF document text
    • https://85097781.com/upload/files/razozabolaf.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/jafutapubigexizofa.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nukeselen.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/73431920749.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zivegami.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/vanixinapavagigas.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///54768159845.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/dituvojivogi.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021091106540673499.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/70148186783.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210911_004410.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/70070261460.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/zobomovesiburofuvipine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=beyblade+ps1+romPDF 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_off0000c0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D8 10616 bytes
SHA-256: 91cc6c0b433ba10cf62d7b5e62c2edc970df3cac3b5d922fb249d3c778617043
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 17324 bytes
SHA-256: 3ee4ac370c4e65b6543a8c14d335a1122981ce11c4ebc119138e8c7c971e9212
font_02_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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