Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f498c8887cfc6ee…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 12:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d88e30d463f7c85e4aa05573e7a0606b SHA-1: 4d274f63c1ae2106dad8e540274baed2e69e557c SHA-256: 3f498c8887cfc6ee05041626b328d5b4007f59c970fde96a59bbfa19f23aaef1
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 URLs, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL structure and heuristic firings.

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/qb756ukbhn301i16f3vvdc959a/38651849173.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765af974952---barav.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/padenusilegagazojozar.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4fa460ba---66073516732.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/60747913082.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/nalisami.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210621211749.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/takaxavesalarafobugemuk.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/1444818624.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vijusininoduzojijawew.pdfIn PDF document text
    • http://monamifrance.com/FileData/ckfinder/files/20210806_BA4A4AC5296102B2.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/12576589695.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/80433826982.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/galawepariterokaxa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160885c7182202---90847064727.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/jibol.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae0c0519e06---8263664353.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/jaladepu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c18526228c1---34445591496.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609644a3de9c4---xaxutaviwexikawukomivojim.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57ab141e8---1823940830.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23e66d18df---modoneror.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/031f0196d083193dfd8902a28e4d28c1/dezalavuzik.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/37718425462.pdfIn PDF document text
    • https://sealskinz.ru/files/file/madototebatefe.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/16888622268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=unbeatable+chess+strategy+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_off0000bb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 15100 bytes
SHA-256: 53a057427934e8b50619d0107fe4f465b6d5dbb3151d4adfb91205b5ffb8e41b
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10948 bytes
SHA-256: 030dd17f0946842a5357bfa9df0a6c6b2c7a667e6c6501514b130935956fffe1