Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc77073228af37e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 06:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bac856b2f287fe54c0baffb130dab0a SHA-1: 5578af2141e81778c5ca9f5db7d1d90b2745ff72 SHA-256: 0fc77073228af37e385fc1af90db926da3d3f43e49896542155114342f480268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://esistore.be/userfiles/file/mitimakatavanusafujanapu.pdf In PDF document text
    • http://schokoladenfontaene.de/idata/sibaninizuzagatumazew.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/zegibamorebegor.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/notidokotolu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/36732619420.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/feea536bc728ae7a50c6a9838fa57799/tapolazapenaluvipoxa.pdfIn PDF document text
    • http://yilip.net/userData/board/file/lefogawetuso.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/divufisubogonopifinig.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdabe7856---31438239809.pdfIn PDF document text
    • https://latework.cz/soubory/13472363181.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/n78p6gtm5okma34spusodqb7j1/51501985749.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/13435322528.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nasosurej.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/56225491150.pdfIn PDF document text
    • http://ruresept.ru/files/file/zijisasal.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/45821373092.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c3625011b80a4cfa860870ee24706a79/7784442752.pdfIn PDF document text
    • https://langumeistras.lt/i/File/40125122343.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/33181788566.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/buxana.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6tlv4b98il9hghkea8bos239f2/35467671030.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1472b4330dbdd6bb945e4f7c5b1fd453/10495179795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=snapper+snow+blower+owners+manualPDF 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_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 10624 bytes
SHA-256: 0323bafad569b9df9e74217c5ba2136d51767be3703dae45f5be941d2799e292
font_02_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 16900 bytes
SHA-256: 08c6832b36d39bb47f865bc6a8419a578dc85d4be67bacebd342014b0a9dfef0

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