Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0cd972c058f503…

MALICIOUS

PDF

77.6 KB Created: 2021-07-03 03:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ff49a1ac8e28cab2d5758d106861413 SHA-1: ad866697122f43f8933064b920dde4965e68d7af SHA-256: 6a0cd972c058f5038a62ac5bb529ec2ae363062da9dfe1b402ecb11d20568476
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic firings related to link farms and compromised uploads support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://seoulsquare.com/userfiles/file/14145910493.pdf In PDF document text
    • http://www.sport-konyv.hu/userfiles/file/45276714934.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8f200c7abd84af3c9dcd6a54f347bdde/nisaliwojesiwo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b17cb1d01ae7fc866d66efacfece5419/pexosimenorefepudaridi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6496278eba---moxuvet.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/36671003636.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/janoruxozibal.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/311c57192a1c6d87b1442fda1b6a3927/52502461102.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/55382e6e1f5089cbd455292bb4ee479c/pifajiduluxuxurapu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e7890cf0cfb29a499181412027814753/50360035366.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/10362636203.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/dukofi.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/tojinawal.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xesofiwipegovowovof.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16088bd9446516---nogoligutowererisem.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lunisemudonuxuj.pdfIn PDF document text
    • http://karatayreklam.com/upload/file///sebadegaxobosumim.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dbf36ea68---45541910019.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gdec643qp4q6ktca49k644pm85/57315612134.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/87807632201.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/wuvurazonukes.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fd47ce98c---16072410291.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/sezajud.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fipuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+th5+basesPDF 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_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 16712 bytes
SHA-256: f240abec5fab3d6c1b2a18c7115f6599003844a04bc5ed4d1a998e659227a926
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 10072 bytes
SHA-256: 680dc2893759a49d4d8df27eef75896e86d1dfcde3067dca022ebec31d415cc9

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