Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa321e972a309c12…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 18:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc659842f065ec0e8332f33b05d87f67 SHA-1: 604e514a6d5ec19bd9678b335f69f530b35d859c SHA-256: aa321e972a309c12cfabea0f56a9c8d7be0a970b7029014a241876f4112d4bb1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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.
  • 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://mercuresamuichaweng.com/admin/file/21957248769.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dfa9ff37---gesuluwowadumesedik.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/wunobag.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bf5a800405b3a929920c6b6925f6fba3/bexinebal.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/40056607683.pdfIn PDF document text
    • http://manu-transport.com/documents/file/tisanijutabov.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/51197577349.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/1458136495.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/44732639979.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/zozobururisuwu.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/venikuzusawi.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109030705256312.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/7627501544.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/fupevelisedegawabex.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/561dbe65ddaf1a656b2c19a743470295/pidebolarotupixaz.pdfIn PDF document text
    • https://denimder.org/resimler/files/78427142378.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/vojuxenoluf.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/dagozogovap.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ebdf01609d1d6d2c58ad25fdd09378b5/2483643642.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/58887969355.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufubizogej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+recover+deleted+messages+from+my+android+phonePDF 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_off0000b7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A0 11324 bytes
SHA-256: 1a0d8d9b3f5f778e1390adea8f93202493ff2629ae59c1ff8deba61a92ccd2ea
font_01_sfnt_off0000d1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 17092 bytes
SHA-256: d29346a09d075c2222d25ef05e3ef40d927f44bececa6c5c6c5050bf8d8fd00a
font_02_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1