Malicious PDF — malware analysis report

Static analysis result for SHA-256 322f1bc27ddec379…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 02:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37c2832fc86d68892bc725d7c20a9301 SHA-1: 24a2a2417cf4eca344ef8140e4d6df1e49b12423 SHA-256: 322f1bc27ddec3790f2b714bdda42ca3c2a1214a5d4564cd02f78b7e83f6a8e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. These links are likely used to redirect users to phishing pages or download further malicious content. No scripts were extracted from this sample, but the structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

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 https://drafthe.ru/uplcv?utm_term=collective+nouns+worksheet+with+answers+for+grade+4 PDF link annotation
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086afb565f5d---5659162903.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f09caff14---41271282505.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210904_213246.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/k90mov3o26d6v6urbgnfq83hu1/13458145109.pdfIn PDF document text
    • http://mmt24.ru/files/file/lidumemupiludamujosera.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f607be5e62---jujawenotonazasonisep.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/sixoxuxukopefazosezatabam.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624ed2147c---lozuwibejamiget.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/liwoji.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736fec0b198---keravizarofudek.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ed30325---gupupoko.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a097f99a026b63f03f7e46ece3f19e3b/36748342506.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/dupavemerukakerinor.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/feb645bad98f74a6fb3f2116266807ec/nugoxotufazubore.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/91790291693.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/6404151912.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/zibumefixalalilesudakeri.pdfIn PDF document text
    • http://usmleworkout.com/files/file/45746421829.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/37bb79b597c73473f07f3b2f4c802d3b/tojib.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/92173034531.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9479begrduebcqqoaica6l9fmh/34351880272.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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 17464 bytes
SHA-256: 9240b4be681bf701f810da11930b2f314f073db6a3d1051598df31ef00e36e60
font_01_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 11208 bytes
SHA-256: 00d4b72b18987a995638613b8d3710b0913923d3158b2e08ab8c42b192771666
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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