Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fc8f0acd558dc5…

MALICIOUS

PDF

100.7 KB Created: 2021-06-28 19:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 29d657920b0bae87580f2fbf133badf0 SHA-1: b467eb411bbb9bb809d15c5bb586a99445c562b0 SHA-256: 37fc8f0acd558dc55ffc0b691625d413b11e1a2dacccc912be9de5efe0bd2ae1
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 CMS upload directories and 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 through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://phayaotechno.com/UserFiles/File/batenidus.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2629b0b2c---nawemuzobikobasigaf.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/21383706677.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4dacec86126b52427b27a96e9ad59b98/ledefudagavez.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/co8l3rdit0r8jvefh3b6h3092b/zesozo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54259900142.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3bd3c81d31b33cdcd4d125f2442f66e3/dugizor.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/bobusoguvulanoli.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9fb496c62ba91977d1eb95941e2de8d1/81005425514.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888410cc699---8170366332.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/7836851475.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/wajewutigudemo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b361db994b0---71482065889.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849975b997e---fugemodilurubabitaga.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/jegosenewekebebad.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9687583702190123bae8c48e1f212e30/76493512569.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lekevumoba.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c282c858973---64652672074.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/92411108583.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/23420737430.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/tesakanetikesi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099c247a58f1---lijatizavipewema.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/nasusigivori.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/22533400704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nicknames+for+isabellaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 16512 bytes
SHA-256: 035d4c2e9b3a07818e2f8086b7113ea7557de7a3249db426bb0229716e826967
font_01_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13901 19868 bytes
SHA-256: f8e2748d9e43a878bfdbefcdc3e3704b4415354b5566479cd36f7e9691177bf9
font_03_sfnt_off00016d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D07 10608 bytes
SHA-256: 395bb8fd8397048788ac5475b721b303b2579e330aca3d275fb813066ce01939

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