Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c1c1db3f10c9c1…

MALICIOUS

PDF

77.1 KB Created: 2021-06-10 03:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 39d47d58cf18b4e9958bb89b3c8aa4e0 SHA-1: 21913bf95b982694f967cb01582f498227ef7bbb SHA-256: 44c1c1db3f10c9c1e79d694a93e354d2e3bb4694f37f038db989d2bb7bc2ec47
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users into downloading malware or visiting phishing pages. The document body contains a reference to 'Tik tok asia apk download', suggesting a lure for users seeking that application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://catamma.ru/uplcv?utm_term=tik+tok+asia+apk+download PDF link annotation
    • http://rund.cz/UserFiles/File/17822351362.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/57ee343710d59cdfd2970d396b46eeeb/83020074573.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5b8a0abda9f798ae34af81abbb1a48d1/61346826204.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6689862f1f411c6b75431a26f97de7b3/wigakosubevobuziza.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/112a1a7699db0dc1b87ec7e51b4d3743/zepanupikikepigawomifop.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fuvupavuba.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9187d7e2ab6c6537ba0d9052c21a487e/58786114820.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/49816897134.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ae6d793ada71891eebe199546d36f4f9/gikavexatijufonugupusi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e478db550eab37e7b6b316f2718c565d/85484957331.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098209d59895---93046441343.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pibuzenijak.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/41a83f198d50e745f898fac3d4a1345a/39221227803.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/gerivexifuna.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160782c6a6c3e8---33569930882.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d426ee27---17352457407.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81b653bef---zovamideviwasujirinalu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hr47882qktv3h0r8pnmfor2ciq/3625000122.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c3b21e7c6e00e7ef6acd06b5b3b47fdb/50209197063.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/goxeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 4960 bytes
SHA-256: 5b4fbbc833e6d6bb0b69d8d9b69846e248fd6525ed59253cd7a1d8f0630ce853
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10004 bytes
SHA-256: e00859e3eb551e4a953e77a52bbae0e4b9fe4614f2ff0202cd4dc32a28c4b8bf

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