Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3a62ebef8769d5…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 20:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00c863cfb8c8d79faf861b7162d0e9f7 SHA-1: 5fbe52ef3ee628353e57124edae656d9c59bdace SHA-256: 3c3a62ebef8769d5690b4b5b6a38609f363dae70ff6e5fa57c83d71583a384a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These URLs likely serve as phishing lures or download sites for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=navegador+edge+apk PDF link annotation
    • https://heuresromantiques.com/upload/files/39056921090.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ba0ee3ad---85502217842.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/47002074078.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/30284608882.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/30606883441.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/gakalijofe.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/83959397731.pdfIn PDF document text
    • http://precisao.net/files/files/7861427954.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614496943fb3d---domeranaki.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/89946739475.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/limuferexalokisuro.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/22887220711.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219281428217512.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/22487070144.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/rutivobode.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/341644082.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134872ed59f7---pobulex.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421732cf907---befipatejudisutavo.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/safumizedifamuxunudefe.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/watunusogenori.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/zoxalafowaditeg.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/26565751852.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_off0000ace7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 16292 bytes
SHA-256: 2a3cbe6194e8cf4b00d178520397895cb19d81a6343c07b1b0d016af5f36c8ae
font_02_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 10196 bytes
SHA-256: 3474210d6fbc618eb8ac304df53a80d24c6254a0b2eeff6d06d9a58d3ae09f32