Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ce1c2d9041d12e…

MALICIOUS

PDF

74.3 KB Created: 2021-08-31 20:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18589053e99b9e07d3e1c774025140ca SHA-1: 0fc19d136468dda48b81ee4b47715b4847a5687a SHA-256: 05ce1c2d9041d12e9984b81598e2b3383de043724fd1df4f71717a0a72d6e96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The presence of link farm heuristics and compromised CMS upload links suggests an attempt to leverage SEO or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vizcsap.hu/files/file/renuteg.pdf In PDF document text
    • http://bhk-aindling.com/userfiles/files/93778269410.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4c4c4b9111dfa31907d32d60de1a8e25/sipegozumepizonozadix.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6980ef4385eb45ea286502eb93f3b9d3/nupulobitexinebetoxoriwu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e6imr81urmirh158ij86h3psm8/vevejajujabemabijofovise.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a8dd4ec0---91176716071.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/sorokugagenetifeziv.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/72006408471.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bubapezefaluregakoxow.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a4b977843---lovot.pdfIn PDF document text
    • http://air-ned.com/uploads/files/89374996737.pdfIn PDF document text
    • https://termocasasrl.com/file/kuvalemuminavafufo.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/kupojinafaduxo.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/97985152164.pdfIn PDF document text
    • http://wych123.com/upload/files/zojebukax.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///24661032833.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/60281293608.pdfIn PDF document text
    • https://bachson.net/upload/file/14862328776.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5fl5cvagphbsj1h1sakp535e7v/7074176328.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d16b65c27---13364336878.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f99sp2st3oef7f2tr0v3a08fk0/bopusa.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/10396065725.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47e025e212---40432739248.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609da90e9fa98---62517304100.pdfIn PDF document text
    • http://leton.pl/userfiles/file/39504566200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=72+iq+meaningPDF 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_off0000c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 16544 bytes
SHA-256: ceb57af032b8738510184069148ea1f31a1e6e6535fa0d0f7289cde4ac3cf0ca
font_02_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10136 bytes
SHA-256: c46fa7dfdd113f75d570a501b0389bd4763fd1fc97cbd42d29ff91ad12a705bd

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