Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2a728e3c167f38…

MALICIOUS

PDF

126.2 KB Created: 2021-07-17 12:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 81ef9a0f1cb25ea25a9d5d680f54a5e8 SHA-1: 70a1c122c65705379a787c892d817a4eb47d1dd8 SHA-256: fe2a728e3c167f38c1070d474c5928035ab683496000af166193379329addcc6
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/30a4f68e66fb8bc1b1e91772585a3748/22084587497.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6315cc09d7---bemenujojixidegudawux.pdfIn PDF document text
    • https://ptogel2.com/contents//files/25254413420.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/vefujukavimanoxe.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/66119799674.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/tinudepepanimitafebujig.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dea180b9497dd8f0d0f336820e98c266/xunigesukopusetan.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/vureselunovo.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/11084796460.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5370e4ae5cfb57d9c8175e8814c6fda9/widugumiluvujekosoxo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccefc3533a---889423400.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b764a4860f746fcbb81189f625be5ddf/21759752207.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/muredorerenoz.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4c6f93822e3ee31b646e0adacb25eca2/mafuguxajoterawajabamiluw.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/kudejiloz.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608685a77c0b4---16445199549.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5a256a5005b0f5bae4608d13f7c823c/dukikopubexepafazuruder.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/02429fdf20ac0bb7a5ec2493fc78f6cb/85282548151.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/vajulamu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bf6f13d3---biribazirifikusivoxodef.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///49299262081.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/netojekezek.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac74a09ec---18516477465.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/6382973436.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a6cb0cb293bfbecd2e225aff605bb8bb/vaxuxozeposijofezobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+artificial+magnet+used+to+detect+direction+in+the+laboratory+isPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B83 20704 bytes
SHA-256: 5d07b5ba1fe327da7f263fb7942f5cffb229034ad35beb1b0019757c54aa889f
font_01_sfnt_off0001a28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28F 11240 bytes
SHA-256: 6efec227b1c2476e40f2b4c83ab4903159d40d81ff213a9d47d17ab7aec24cec
font_02_sfnt_off0001bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D49E 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9

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