Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cc42a3b74cf61d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 09:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4f744a950d984e144c0a4b6137471d7 SHA-1: f9be9782e3068aabaa713474a011159aaceee787 SHA-256: 75cc42a3b74cf61dfc29fb2db9ccc8cc55efdf381dd3c36e834b3618e1ab1c6b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on various domains, many of which appear to be disposable or compromised, indicating a link farm designed to obscure the ultimate destination. The presence of a 'callback lure' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the structure and heuristics point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chanhbon.vn/media/ftp/file/fikejupenuwetar.pdf In PDF document text
    • https://n-vv.dk/userfiles/file/darupek.pdfIn PDF document text
    • https://aayams.com/userfiles/file/kosenilo.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/roledikagozizopaxijagal.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/metegowote.pdfIn PDF document text
    • http://cissi.it/userfiles/files/81810212439.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/sixalazakuxiriginuk.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210910092028.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/nobabugubebomi.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/69989206167.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139f08b7570b---14372961632.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/82912078631.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/27247226182.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912439ec56---fegotusupijul.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/garuboges.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/regewamudufubefi.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/lumafadibak.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/jukipuzedubumoworetifejiw.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/ranogukagibiz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d8217db8---fumojeninase.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/kixarelexej.pdfIn PDF document text
    • http://juncheng.tw/upload/files/nudolegepalepatud.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/kofonomibezugalelujal.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/vokuvozuxij.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/29355125773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=i+lost+my+windows+8+product+keyPDF 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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 17780 bytes
SHA-256: ffecbba271ee373c442e818c682052299c846a0c426e117679cfa6479c7d3e2d
font_02_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 11064 bytes
SHA-256: 4c5839b6c5c561257df17b95ae6e55ab70c0cac70d6d0a3d619537c83ba3983c

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