Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e9867b781e806a…

MALICIOUS

PDF

83.6 KB Created: 2021-08-24 21:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: db3b9b05bc8b88655ed33617acbc52d9 SHA-1: 93f7a10ac258eb96a46628bbb2f664a2eb7f3c63 SHA-256: f0e9867b781e806ae0ba3ffff481b339f2a41042e58a207a0fc71c94f3dcead2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pixel-pro.ru/upload/file/28146053785.pdf In PDF document text
    • http://apex-architect.ru/images/file/vabeg.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/95125775470.pdfIn PDF document text
    • http://zxsolar.com/d/files/63400652135.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083664a0a62b---77823079691.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/68172522778.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/kef483m230hv6srkm099i6v9n2/rapopeze.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/junuvesubimivixezakej.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/gimopuza.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/62182215004.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/90206446164.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/48925294580.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db75853c4---tipuxegulorajiporojimixa.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fe86e80b---gilotunukuwiduvoni.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/lesupovexujapirivesip.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/xolonesajasaletumawejim.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/saramewibokimutifovazidis.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/mogiz.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c55a5bbadb5---rodizuso.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f14700b91c5---vevunisuwakixowowa.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/supemunefagenuwezama.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/5327221109.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa24ed148f---80213100131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=diary+of+anne+frank+excerpt+pdfPDF 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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 10708 bytes
SHA-256: a4cc5ad2fedfd78497a27f0f93c62774fcd4778dcc5cd62bfb853fa21679a4f6
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 16628 bytes
SHA-256: f775914546c95c217ab3872faa671f31cbc514717d4785d90055d52ce9ef76e8
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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