Malicious PDF — malware analysis report

Static analysis result for SHA-256 916978715abf2ace…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 19:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 27d4a7f5d3143195736734d29a0b4a91 SHA-1: 6b24095a7963b323688168d2e764c9ff68667cf3 SHA-256: 916978715abf2acefa9b413d97b0ffdc441348b7661a03405906092fe9dd2fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=soil+formation+and+evaluation+worksheet+answers PDF link annotation
    • https://osakadentalcare.com/contents//files/55762385870.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fd16d3bb1411dce31a784a15e0589b8/59256904992.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/vojalogadiv.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/gatixi.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce41fbf22f---xazatejuwokiwox.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/43388673973.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110b377dfc47---12582172999.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/setulesofetakeneluseriwoz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90118059101.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fc57cbdf526bd32beede5e11fb924b27/womotad.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/74967526278.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/67aa8a3dff59fe24e464c962853ebfc1/wikob.pdfIn PDF document text
    • http://northcity.rs/slike/files/7174186887.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1ab72016608fca8fa32d1f518b8f2fdd/surejuposokan.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/gevikevizexo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c928ef686---jidekuza.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/feboxelowuxakozazoti.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/8442312950.pdfIn PDF document text
    • http://ezibra.pl/upload//file/70431991506.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lasikam.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/34647489866.pdfIn PDF document text
    • https://sapporopools.com/contents//files/momiz.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/82pnvgessi3n9hambbkj2qkqdl/piwutax.pdfIn PDF document text
    • 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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16296 bytes
SHA-256: 9ea66d71341e7a35b24fd48b72fc5a7ce967347417e38fca51b3373d083633f3
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 11040 bytes
SHA-256: 14ecbd7944ba3f1c708e3c4af37f56117f84175b8001865418cef0c097b2b7e0

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