Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45a34100a2f717c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 05:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7fb166c02e37e2324873693f009e5b27 SHA-1: 69754aeb2885f31a7d0899c63bf03d88e4af216e SHA-256: a45a34100a2f717cd634dcfcc3a06c9ab30994a88dc2957bd1d156110938a67a
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's part of a link farm, directing users to potentially compromised websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or further malware delivery. The presence of external URIs and links to compromised CMS uploads points to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/i7nvhoo0uqmbn06105bovamo67/figupomaluken.pdf In PDF document text
    • https://vieclamday.com/userfiles/file/nejesuzudasifamixa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8tu84hfg6l71ed0alpmqcu4nd4/41622117821.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/mudijerewapatikapif.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/93496347611.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/nokenenopumovamanobifos.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4b4a6ec949a1020645ad8c43dda39e30/39399667149.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/oa795eo69argpost8pnht0bvv5/76719711305.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/nojisa.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a11ceaa606ab6fa7b0a01a45f031b3b7/gupofimevoligetaxa.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/sofazemijaw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9bf18c3ae---83911550892.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/kedodofagumosi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ikmlnc81pasfm0988gdd2jv7js/tepasorobomidugaxeziro.pdfIn PDF document text
    • http://npas.ru/pic/file/fitomedutixukaxegepez.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210812_E4FDDB938DF38D2D.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160adb93aaaca6---57085283770.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/16788293050.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/23221120328.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/lenazobide.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/49161590260900069ef444.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908275dc6e3---pubilamul.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/gijobufedozasobagupeduwon.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/47103006658.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/wabapolefedanuvofusafu.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=acute+on+chronic+liver+disease+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_off0000c406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC406 10864 bytes
SHA-256: 9ab823ef0843394239092bf47c33ff533ca672bcb018eec4aeed4e6deee72e71
font_01_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16208 bytes
SHA-256: 8ea92d64dce41b12b96d29cdfd47cf44ab69d372431b68c166139ad70043f29a
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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