Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec756a5b9499f67…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 02:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 293d54bde2479471af4b9df00753b425 SHA-1: e6cf7a7885f631dc0db462adfc194288c8b841d0 SHA-256: fec756a5b9499f67788bd989f414e487e7d869c4a0f8acc7b02639735899eb2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=secret+neighbor+android+apk PDF link annotation
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/duvarokatipukesaze.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/93159481131.pdfIn PDF document text
    • http://chineseclothingonline.net/File/2386200509.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/12131765335.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09f75afd4---fodekunixuwimomegi.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/dulaxotiledusegowi.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/21483092513.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/29136770848.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/61044446503.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/79173024597.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/begifojajixipifavofizurup.pdfIn PDF document text
    • https://penzion-palice.cz/content/xifegofixadixinekimabafug.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/28679287477.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/jazunulobutokutiwofuka.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/60866697781.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/65606414621.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/sedavitoliduvumew.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210925065149213186644.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/67290980189.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tefugudeluxolixirijaxa.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/zamokidikaxunorenazerelum.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/93016619402.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4333dbb0195ad46fc9d4e47d52e4286f/venoveroludazovaxubolol.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/bujib.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/17060637921.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e994fd5f98---palumijabipos.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/wasezesimidufewojewapup.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_off0000b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 14124 bytes
SHA-256: 13541da6bd1b4724e555929c5ed4438904a94462a5273bef3b28c96bb0c05d4f
font_01_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 10884 bytes
SHA-256: cbbd05d0cde3a1a1934dab359b0e9cfe693ed0359ccbd4027bece5d91c5e085a

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