Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3648673d5c6c4ed…

MALICIOUS

PDF

92.6 KB Created: 2021-07-13 19:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc7291c8eaea629c1c7097c670077c75 SHA-1: 5a18bdd0c91d6ac0fb15eccc3053f89ec8950f36 SHA-256: a3648673d5c6c4edc60bff48a683cba221eab19138affd97119390b320cbaa1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=hiking+in+seattle
    • http://gptools.net/userfiles/file/nemijodofopuzozajomejupam.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0e09bbbac48772765b52b241d500b21a/23553627155.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160934b79b3b4d---84878040411.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c7265fcb9a7---56983113371.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/gk21dema4dengfv4s5o73517k0/34838999503.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8bb49b4d4---7624316084.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607560a0a5ac6---41706518216.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9a29cefd---99643208551.pdf
    • http://colafranceschi.it/userfiles/files/mebolozolol.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/pipijuxeles.pdf
    • http://bafiti.com/sklep/userfiles/file/35032957126.pdf
    • https://akapacha.com/userfiles/file/topadobipumut.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8f1e448d---xufagunasajunum.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4d4d8a3f---gelawonised.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc618f55b---bodixuxibubakedebasawagev.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/46b9d47c62525a33f4718e03479de111/51440741401.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df994cda7---gagusekidus.pdf
    • http://auapp.ch/userfiles/files/75596060089.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9fd3d03d9---24524216856.pdf
    • https://autoskola-scp.com/files/82511978632.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acdc72571---rulafewuronusuzabef.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/301028521363.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07090d236c---bedeniganode.pdf
    • https://rybczewice.pl/userfiles/file/zelip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097b.bin
7717b513cb2e23d6ff02b0e5e46378419a46dbafd135bc2a25305b4903c45041
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 17428 bytes
font_01_sfnt_off00013653.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 16792 bytes
font_02_sfnt_off00014e6a.bin
3a25668ae1c417391348796466a3af1c3b679d66e17bda6cd39990ebd3211085
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6A 10148 bytes