Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d43fd141411ed8e…

MALICIOUS

PDF

100.3 KB Created: 2021-07-18 14:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db7971750c5843a1a6692d72f0f60031 SHA-1: cab40e5af00f2215ba3aa012d1ca827d83361187 SHA-256: 8d43fd141411ed8eaccc705d275d7c446e07a37753631db8c4447b65f54aa049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs that point to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution attempt, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hvj5cq0t9dv0b87ci6ko4c9mou/55597228641.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4q9a7opql9qrprihg9p20cr922/10424377902.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/475173201f59efbd63ad839405cedd4e/79478633485.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/ruxuzaxefatil.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5ea16e72b463eb37549a4265d3b1a0e2/56905643948.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1a1c12e7---2237974266.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/88623466211.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/ruzogurovebikapulisus.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d257ba1da2f67c2274ce5bcc3676e489/gadonamexis.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c831e4400---7353910499.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/dorabaditukezosup.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2cfe68122---31910629156.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/37383691268.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c51d438041---fiwuvejizarepukaxiwema.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/8155603387.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/hl4mu1eb4ie7peeq8p9r0tu3k3/gevunipibun.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/73a81ef5e1c5beac8511b30fc0eb6ef8/57177810792.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb197fc7f---vilata.pdfIn PDF document text
    • http://sam-global.ch/files/file/zawemadaz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d57b35b181f---saguvekip.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/7d444891b7b5238615572e7b2ccc300f/47854372338.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2o4b2cvakne95djj377b6jq546/31870831156.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/fd44e7c05fe4d39814848466a515f029/40941480377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+elf+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000118ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118EE 24124 bytes
SHA-256: 6e53301c06afc69b1ed0dc1d7462a54ab0df3b5040e2e3fed91c3c41cbe89f87
font_00_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 25676 bytes
SHA-256: ff21cec577228a7c708c8cd3e5c72fbb376c4222e58d2aa8f730e4c8761ef02a
font_02_sfnt_off00014552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14552 10288 bytes
SHA-256: f096b74feb530e2cbc8a8e1698d8d13355bec52a337f94c3b366c96dde738ef2
font_03_sfnt_off00015c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17467 3264 bytes
SHA-256: b32c7786393e3f036c793d8107a23740e2271a6a0a474f34576a9fdbf87ec782

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