Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a1fa3527ed1b15…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 05:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c89b1a2135354a165b7733b839d254cf SHA-1: b68f9262038b60a6a54bf2c5482e812ec9e714b8 SHA-256: d1a1fa3527ed1b15bdcaa6fc91b5ddbb802e9f9cfacf4d57f7132761ff2ece5b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of compromised CMS upload links indicates a potential pathway for distributing further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://diskacme.dk/images/upload/file/46423467334.pdf In PDF document text
    • http://regcureguide.com/files/files/kovezunaxasirifalure.pdfIn PDF document text
    • http://pk.mo/userfiles/file/furazokevor.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf13cb05d---babawikubaloka.pdfIn PDF document text
    • https://magatek.com/documents/file/movexumadoxisawurix.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/466dc15e7a74ef7cccf031d2b64a4955/5310688658.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed361c1eb---84373452575.pdfIn PDF document text
    • http://precisao.net/files/files/bagorikidi.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/wodijemari.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/19955852125.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139062d53bbf---kujogub.pdfIn PDF document text
    • https://brukspec.pl/upload/file/muzevojorakavutakaxikagoj.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/nemedosokexasakosafexuw.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/8999721145.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/lizelar.pdfIn PDF document text
    • http://keyday.ru/files/files/lejunevowujidivivumij.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/gobajula.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/zivonudimanemukokot.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/37709271965.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/vivesonapav.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/93385913931.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/lajawavadalurifo.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/fixivipalufajut.pdfIn PDF document text
    • http://riversedgefm.com/files/file/paxifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+spy+app+remote+installationPDF 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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10648 bytes
SHA-256: 669dc8df9a302677ee854272836a9dc88f68b67453706db6b7312cbec36af500
font_02_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 16940 bytes
SHA-256: 749dc799a90cc371ed235c93dad0718b2ce23e2137efaca902d9d98c8e7b479e