Malicious PDF — malware analysis report

Static analysis result for SHA-256 929085df1cd48f22…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 23:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1433c277c19ecb388f1d73c764ab7b27 SHA-1: b5f057d3874b5fb20348c47bc47b7b96bf3cc77e SHA-256: 929085df1cd48f22fff916ceda6929bba1de96fc2849ff7b839ae669b3a4c292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dzstock.com/Upfiles/file/leperitan.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ae1d97f94d97f2b043fb8335cf6d9dc7/poladexojo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/jiwewonuzatobipiki.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/puzinafozogarewulogop.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609989d759848---garaxelaborosemifenata.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/0a28d5c681ccda15860c527f70635567/gozamodor.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d7a3cff2e5b34e1f65d8174c040798f4/resoxezivuwobisonazozo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9c2940b3b33dcb49f07fbb71d7536fcf/8966942194.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/26258280524.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/7149478107.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/56893061198.pdfIn PDF document text
    • http://falerisztika.hu/tmp/kewadudugubul.pdfIn PDF document text
    • https://renault-service.com/userfiles/nogateba.pdfIn PDF document text
    • https://alutat.com/data/file/zepokomakuvow.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e8220a26a494d7e24d1101b53476b0a0/mizomelowixajobogida.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/fazowilitunivulake.pdfIn PDF document text
    • http://gdaniec.com/upload/files/rirojatesokoma.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gdlddmuv7km8rs1eqcbsch1q87/57440997633.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3ddb814a9---rogilosedusegexikididulod.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e815a50b785---26625276035.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/tiwanomilov.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ed8cfb090b331d51f351f120d689b9b2/xadofumabefo.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4ed0486eca03fd24d6f68bcd4f99cae2/kemivoxizewololuwo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505111514856575.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/boreradomurodogikex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+pdf+reader+android+quoraPDF 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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 17140 bytes
SHA-256: dfd19473df9e2026ead06edfad8c69c72c446d557c60cf2b7a35b98b08e7e21d
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 10744 bytes
SHA-256: c3f6961ba09a86e822f2caf4eefdda71ede4b587e8232319268b322573524cd4
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1