Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb892e4df97ec725…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 18:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b14a1072e42194804f379e5237a4e19 SHA-1: f1b91eaabe1199ca9b360c61379a4f99277506ec SHA-256: cb892e4df97ec725e629fa96bf26239dc38f5b09dbe6d954f3bbe85ccd27c766
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external resources, which could lead to phishing or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://xn--b1akwe.xn--p1ai/userfiles/file/89633748444.pdf In PDF document text
    • http://delve-cr.com/uploads/80313488048.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/81953857941.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-14/20210614105213119597.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/21vqae9glcmu6n475on159i7kb/nigexejojofatesakesuke.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c195aa1db6b---vifejeranoruxarabimi.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/99948487022.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6f5bd2db8---jonalufurakoxoleroniku.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/35451805400.pdfIn PDF document text
    • http://rhondachem.com/d/files/33726466412.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160995bf8ddf08---40242803229.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/koxolavovozolujemisowusib.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/6978486164.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15b4d2d1ee---55278878148.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/webulesuwukumowod.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ff0cf9e6---sixajiwarivoxanotej.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/65add1a3e4f4a255e2aa4c1f04c0f083/65017691205.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/43575157836.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16086c03b76ebe---nefemisesotu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/97500312.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6bf855271d9536ca31d1e688efbd9aa6/wuruwenibavetalat.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/wogipavorowatigiferi.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/36549329652.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3uhmdrukcmitevii8b7ci2gkl0/pufabuviwanarefureso.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/vamuvepokokufakobikebeba.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/fukufenuzibifusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dell+venue+11+pro+5130+camera+driversPDF 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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 11224 bytes
SHA-256: 2b1f4594c2403c0afd215ec267d67a62782efcaa7d24af8d4f06d6dc5b24f6b0
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 17644 bytes
SHA-256: 0c248a40974dfade646a643f826f4ca0aa03045c27f3c2039b0a60ec200e0a40
font_02_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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