Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2834e7ef35ce6f2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 06:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d726b914eaf822801695a1f08f5819a SHA-1: c7a4bd4e6af0256b532b46c32229cb983a0ba530 SHA-256: b2834e7ef35ce6f2b2389aabb91dc24fa6b08340cd0c2e40314b8ba4c9392799
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM firings suggests an attempt to obscure the true malicious destination by using disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c10a67035b---4138138516.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7bcac7be---17353385778.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/71305416899.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/vavak.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/95360428855.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/laluperovibofiso.pdfIn PDF document text
    • http://soles2walk.cz/data/file/pitizamunapatog.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/91848053312.pdfIn PDF document text
    • http://halmar.info/userfiles/file/raruz.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/gurizotuguvexumavo.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jusotojepapolup.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/55055489813.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/23905898658.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb180b5858---4616402412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466dbede053---posasax.pdfIn PDF document text
    • http://devison-matras.com/upload/file/25630931027.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fewipopaxalos.pdfIn PDF document text
    • http://rapet.hu/files/gebepazazojagelotifow.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/lerivelafakezebezawav.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/78349a3f8da27a1f1d05a1dd15016524/85134614708.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f3282a48---zebidevu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/xironubofasevitefinevuke.pdfIn PDF document text
    • https://chv.vn/userfiles/file/vefosunapufirepoxi.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/solizivuzemida.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/48532255178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+send+a+live+photo+to+an+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/73188831595.pdfIn 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://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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 10632 bytes
SHA-256: 1c85394e3355ff2af21fab293af6ee21fbefdca93dc8127f6c0e9e6913d14f95
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 17420 bytes
SHA-256: 68dc03b88b1dcb94d8809cd0e23e3ff11687d37b24f9d628ea64c86fffb75f9e
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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