Malicious PDF — malware analysis report

Static analysis result for SHA-256 057d07dd0cdbe7d6…

MALICIOUS

PDF

82.9 KB Created: 2021-06-29 21:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 263f40718ff654610f6648f8581def32 SHA-1: 2aa674b3cabb0b92c49538b05ef800c2f4bb0eca SHA-256: 057d07dd0cdbe7d64807bee44788e2eb2480d432929265dde4064c17fde9d068
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

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 https://wastran.ru/uplcv?utm_term=the+difference+between+financial+accounting+and+management+accounting PDF link annotation
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9di2idn6jkj9d7sfg12mfvoilb/25512426710.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fda3ef8cf---88076450712.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee69058792---duvowomoma.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b8737ca7d7d---xegebosijomurodobumap.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aae80e4bf---kutixagalobebugoxabut.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c08ba1facdac1366d13a9232a2965b03/31469230453.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512115145117797.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jumofopedenoridokema.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc884081f---67555396520.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe125767a---nipisuwobetotadon.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5157a436e1f6ff9badcce5176b903505/mifodobiloluxutawavofup.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/00be9cfc9e75b8b8b7eefa20409bf4d7/rorowovexuxalapig.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/13933815906.pdfIn PDF document text
    • http://ezibra.pl/upload//file/25837291959.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d6ah1ncqa2qedp2sh8tdsu4hva/rufupelidedekevapa.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/47969034612.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/84226310690.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/91151661145.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/76d53431c948d5a5de080e24775a27da/lafet.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af426f32cb3---bifimutaredijixaloloxuzur.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/841dd570366f716a097ce7abba3b55cc/xofopikenob.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074604094d63---88085934617.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804a1fc4fe8---visixupufebatavuwe.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f8750359344048ba127d63ea52a1322b/62643271403.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bdsam2m2gsdl5i6c4u74mhps07/39439504726.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/57661755842.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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16604 bytes
SHA-256: 55a71f5af3340d8f2989205631cdf1601c4bae0b0970f816e91395fabba1475a
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 11044 bytes
SHA-256: 4de6e1beb498c04d23eab8fdc3b72f6068d2cf90034e4a711f85f49083b9bbad

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