Malicious PDF — malware analysis report

Static analysis result for SHA-256 b769ac270bf2b545…

MALICIOUS

PDF

87.1 KB Created: 2021-08-13 12:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d1159d9f2d784cd93e3c034906367ba SHA-1: 80027fc3a1f34e0cf987a72cab99383fb4709848 SHA-256: b769ac270bf2b5459811be9a76a4432110f50334168197b8c9b5d7e9a461e87c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a brand-impersonation credential phishing lure, specifically impersonating Amazon. The document contains numerous links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+thread+a+brother+overlocker+1034d.
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790aa06da70---pokux.pdf In PDF document text
    • https://longhoang.vn/upload/files/bisobabipa.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/nonabivag.pdfIn PDF document text
    • http://boxethai38.com/upload/file/gafufozeti.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/96729145088.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc94177259---jemosirigaget.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/06quhr7h7rkbo9aondjaiq527l/milemejobuzamij.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1467b659d---43013623350.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77995238f---daxobodagop.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gawurosile.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/lexaxemabu.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/basuligegeb.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/teritavo.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3f552dce---puwiganelevetesagezajegaw.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2och3mcptbhjptlqnm8pe5pd01/wafagozevedowigokotibil.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/givezam.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/62963702894.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/51019305111.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/tatimosokugumogasuteri.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/68380326805.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc807b5650---pominolepegabir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+thread+a+brother+overlocker+1034dPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 10904 bytes
SHA-256: beab24a8c533aa89023aae193f0420418688348191858c39231f1a71715de7a6
font_02_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 17108 bytes
SHA-256: 790a7bf20f2f0f0b118d415a7ca9fd6089fa03ef408ccbc4bada6e2ed272a75e

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