Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39cac4f4009cb97…

MALICIOUS

PDF

71.4 KB Created: 2021-09-23 18:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f51848cdd03accf2d96fd7f71f31aa49 SHA-1: b090571b3aaa5ab22b542306abc07b9055625592 SHA-256: c39cac4f4009cb97827609106951b18773f719d80404c25b4fea0007deef165d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=nfc+meaning+cell+phone PDF link annotation
    • http://ototavandosemesi.com/resimler/file/61862154528.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/bixiluriwajofesiwik.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l6o14a6oop0shombsq8v2v91o0/47144412827.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/dupixigip.pdfIn PDF document text
    • https://izr.fr/files/43444781656.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e4f7db85---jalanarevesigi.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/3611444789.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/wabivizisukuzonupigipaw.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/54101747936.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/31231072808.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/babifomaforofilumivota.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/sojamufibozit.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/80476226259.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/gogewenewenonejedobi.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/52257987326.pdfIn PDF document text
    • http://talleresjpg.es/img/file/95441630471.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fecda9a3d---dulibazomoxolerobufunedus.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/12374403953.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/naligimujebo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132680fb917d---wafurerafataw.pdfIn PDF document text
    • https://izr.fr/files/72658478211.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/36241527902.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/jofitagowoluvip.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_off0000b7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 10536 bytes
SHA-256: 9b7ade45b6c70f73a1baed34608c3fcc85a963b5a08901305a1c137c4216e3c7
font_02_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 15956 bytes
SHA-256: 35a40bdbbdd038cf550e1c93f3ebdd4e3588f3640bb96001ec2e55efaefed2a0