Malicious PDF — malware analysis report

Static analysis result for SHA-256 620fe886c15a4feb…

MALICIOUS

PDF

99.9 KB Created: 2021-07-01 21:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 341333b9ff8f56a8651cda2c2e37cd7b SHA-1: b8e526c287aedf05e36bbdc2f9e823bfdd846194 SHA-256: 620fe886c15a4feb20de247679f13e3fadbe11579d61b5fb11f6e11a87bb1f5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the link farm structure is a common tactic for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a57e97109---rogukekosorepuxufozututi.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2144784e8---17285160207.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cedf7233dcdda26bc9c72bef48cda3c8/59775866137.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16099efd3bc3f4---siwabugabudugapifiw.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/6912720891.pdfIn PDF document text
    • http://belst.by/upload/file/40522992301.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fdbcef1615be7b9cb232623c51ac220c/gesupimezubonisebakeduv.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b841c2f53f---pinanakitepevo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1a9afaf9ab9f59ecf0039c3e02eb0258/40768213720.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34702ead---giledarinijuj.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720bb786914---62960310559.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4142b283---jamalazisanupuxog.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b5273a6a---nivifodesoluvoni.pdfIn PDF document text
    • https://o-dance.com/upload/files/tunoxuniviguzesowidagoke.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/nemamisenudaxabexejowa.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/uto4c1vg2ce3mml2i52iol1jnv/81595250770.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1510a914ea---zabak.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b4027687---57561693149.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/40581087340.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/fulige.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/0f14f7bb11dc3372b0ec391e475c782a/9056195150.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/33076228340.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/93961b4d0a39365435391daf222bb7ea/nirovedirodazizetan.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc10d937ad---71887152024.pdfIn PDF document text
    • http://erex.hu/upload/file/69091143323.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/fanokeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=not+exclusive+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015977.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15977 22364 bytes
SHA-256: aea7db39d018702a285fac3b50e506e1c0ce03b479317862f4c0d768ec1cac2f
font_00_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 10716 bytes
SHA-256: 53e97c874d3ecd8f13d9432d40dcdc89212bc94e323a4dc854d6e7999c5daf8a
font_01_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 18956 bytes
SHA-256: 1894deda5af39898731635f9786284a9cfff7cf6949de6436a510c05bd297a75

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