Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a7c6ff97f1874f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 09:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a05ade45392aa6b7f779f750314d4e8 SHA-1: 52c135023f1d0f1d2ae362c99f59d40153af51e8 SHA-256: 58a7c6ff97f1874febb872e31ae11152559bf9242df482bcd451a9137d42b11f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the nature of the URLs and the PDF structure points towards exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://safarekhoob.ir/basefile/safarekhoobir/files/pevujugikutazamesotepufol.pdf In PDF document text
    • http://kstarsmall.net/userfiles/file///16141748314.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/34264625477.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/32162127981.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/99395389629.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/21607196059.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff70120a87---nawexegabirodozetejibufir.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/mamoposasukiven.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/donasonaxuvujadowod.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16092f6acebd8b---77508481520.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/niriwuvusolu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6d926b63---47944020821.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/8s10j249n4v235dc4kfa07elt0/53994833915.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/dobawexinegozubojabada.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0043d1a398---kivixuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c944fd2974c---zixijilimoba.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a7ee8c580f1---soviradowuxumegisos.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vcfblh8q0i774k6rdquk0apgl4/mibizikijeniwimasotaf.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qu3qlbtbld09d7upsubpqpklg0/balolapekulowivifu.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108260112216974.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/nezonofevokoziva.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/mutituluxinuvudoxidinud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=remind+me+of+your+lovePDF 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_off0000bbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE8 10412 bytes
SHA-256: a0ec8c0b148f55fa47dd8654a2dfe71178c75ac6fd440a16ada2ef806c17e91b
font_01_sfnt_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 19596 bytes
SHA-256: 4db7cee384125e7d3b3717a33aefe728077e7c136cf10ae561c170610e8a2dce
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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