Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13ff9bdf02b1995…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 08:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 767dd4dd268e68ec5b25c719ac4aedbc SHA-1: 7da5fa980c12e0c9e78e786034c32c78678403a5 SHA-256: d13ff9bdf02b19959d14222e89978cd90dbbc59b180789071404c8235bcb2996
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is a common tactic to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=forbidden+power+pdf PDF link annotation
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/80544179997.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a1414396a86116bca1645008e214cc15/36561556460.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cf9e7a35d---44949850532.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/68605141515.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/91523280805.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/39572004235.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/80792593640.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/sogebefakeve.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/pafujufetugusizamuxa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6a78d849---daxabulewuk.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6dcd6246253f17a2a4bf893f242045d7/27804558330.pdfIn PDF document text
    • https://norservis.cz/files/files/17091081254.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fjupaqjaq4p1pa7lvjesmvmuid/54214844377.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/37477965090.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9d5af4b1---wejidulogi.pdfIn PDF document text
    • http://ipllaser.in/uploads/21354113054.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/pak4s2oegh2s20ig3f6c1krlh3/fibelogasukuvenoguromo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2f5600b5f881afdba939feb425ffb646/61879982638.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/47462458400.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/9896651779.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/65015877857.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/tigemesejofofisapuxol.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/vazuzinolutode.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/27277288219.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16085e1123504f---67074393460.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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 10220 bytes
SHA-256: c9eb3b0e9742f5542f821eb6226d2fe678fe462038cda5548740ffdafd02a05a
font_02_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 18496 bytes
SHA-256: 16d44f357afb76c076fa79f02127a36297593894ae29ee98fb78877c983b0109

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