Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2e6dd906608f2…

MALICIOUS

PDF

109.7 KB Created: 2021-07-21 10:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a13155499934659ed07ef49d658cf37 SHA-1: a87b50776f1b957bf7e77e14367f0ef2614f65fc SHA-256: 70b2e6dd906608f2261bfbd43a695431b0a55af4f3226d18cf26e73d8d214ae5
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, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, possibly for phishing or malware distribution. The presence of numerous unknown URLs points to a broad campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977cb934226---33759623179.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d00049685f7---bujumikaxulinowoles.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/92581266219.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/puxagevazojexi.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/64241209769.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/rolusonefex.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/pevujelibakexepumo.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/zumikoluruzozejud.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/fitutomasanifavulex.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982fea2de98---fekedufosodutilurow.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r5vjn51m82fq11bko4j1vrofs3/likuwekirirasuwebapixumaj.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/notimasoxasekudotekodas.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/zefudupulivusizipuvulo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wusalorimafelirojepuw.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02ac7c31a---41549092986.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/xedunixubib.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ae4af767c368ce5d7ff7dfd109aab122/mawusavivowuzokap.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/mebipuvogigepasuxixedew.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/nexivu.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/91820014449.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2d771e33hge0id1tq2k48506s1/sagaxadafopalevuwam.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/97089606388.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/r399u6bac5dhlpe5cakg37m2co/17512835485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=samson+and+goliath+in+the+biblePDF 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
font_00_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 19852 bytes
SHA-256: a21b29bbe5536d1508908ca6318620f85bc699f28295e4a75af34d40c1e4a4ff
font_01_sfnt_off00015fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D3 10812 bytes
SHA-256: 8207f49e3f8bed95331e74bc815acaaa86bad989bdccd9c7a2408f8931b44c70
font_03_sfnt_off0001903a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903A 16992 bytes
SHA-256: 8c5433ad4a3a9efae5043fb46b168398ace670ec7e9e88192d9d79227c52c787

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