Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f69899748a55cab…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 23:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 48271d44f5e003b2820c14458767d55b SHA-1: b5c8cfec5d57f7b435b4a27cde465b145e764c92 SHA-256: 3f69899748a55cab1ff7773079bff996a5f462f12b927a0ffb5d94cf37de8c02
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF file is classified as malicious by ML models and ClamAV, and exhibits characteristics of a credential harvesting lure. It contains numerous links to external sites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to redirect users to phishing pages. The heuristic 'SE_MFA_LURE' strongly indicates the document's purpose is to trick users into providing sensitive authentication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://queure.ru/uplcv?utm_term=how+to+add+hotmail+account+to+android PDF link annotation
    • https://omprintandpack.com/userfiles/file/kesobarew.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/12818284049.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613945acaaa4a---27338099981.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/25104319127.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/74811078881.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/37604984041.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/93858873596.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/15909556509.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/45851222984.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/sigupaxizorazerusafijeram.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fd16116bd68542d7973071a8be823607/46817995095.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/29769804467.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/27461158623.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/42664846745.pdfIn PDF document text
    • http://landpas.pl/upload/file/47169201201.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/99871383385.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/11765777059.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210914135433.pdfIn PDF document text
    • https://totounited.com/contents/files/vitusapomafolemibirajefag.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/56351776041.pdfIn PDF document text
    • http://freewest.at/45240543385.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/busavudijetobinerizuko.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cb0dfb34d4317d43f6a59b6734248426/rilodurevutamirovetebiguf.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_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 10512 bytes
SHA-256: f6335ef13baf66406be51b21bb94fe5b4ed70b59dd51ebb9f269f5f02efd886d
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 16744 bytes
SHA-256: fd66a8372a0e7b8edc743e228c99432d6a2acde2eb1e6984da6a1cc37cb6c23d
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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