Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dec083a1f02cb89…

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 18:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7bb27c2aee104b0062f41aa546fc1884 SHA-1: 4eea910e95097400833b49b14e0aa07b3a0a641a SHA-256: 4dec083a1f02cb8968a023d32d6aff94de46b97650569512382e16178a88abba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and link farms, indicating a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=what+is+sog+in+hockey PDF link annotation
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e11b4eb287---lekolabuwubuvifeg.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/71255580460.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/78238793687.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40462984980.pdfIn PDF document text
    • https://digireg.cz/upload/72121938575.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/08ee5050dcb77999265fcca7c3618a49/74595820828.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/iumrcq5rmms69koqoi1pdmqfts/84141305181.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/d77fe2fcff430bdc05a30f020d2d0053/64758836947.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a904b9cc---xujejanozawatemewek.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pibejobow.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/dutopelumilupenu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a902d63f8cce9cd95184c88051a4cb5e/sukatasufutarudiguloful.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/2lfkrnkapmlokh1f45fk8ej7u3/fafuwuveguvomufaputelew.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0b172e81---fegivomesabora.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fikokugiruk.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/7828035790.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5000447e9de3a80118a01ee7774c7b47/fagowod.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lmsptv74nuti96hr2cegqj86cu/xorugujosimugoxeganisun.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb930d1d17---zebesujepulexina.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2d96a382---gorusuzoxesedodiko.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/qtchsn4lniad3j41b20hat2s34/6568416722.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/kefonotozetopovidoliwow.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a8a2852c06309032e43a673a3674d630/64392283919.pdfIn PDF document text
    • 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_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 16960 bytes
SHA-256: dae21bd5eaeb7283894895e09755a7602ce7a0b11c2210334fd12e6ceea0fee8
font_01_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EB 10560 bytes
SHA-256: 052bc4451063e0218978640092344edd02d8df71caf875297ee422f6d6a87656

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