Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3960e6ec394cf6c…

MALICIOUS

PDF

112.2 KB Created: 2021-08-12 07:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a59a472b2f94d2b88b752811297d5961 SHA-1: 1da53d6c507723a277ed8e39c5d9fb986a6e9d80 SHA-256: e3960e6ec394cf6c8dc31c2f6c87996f2e8cd51637448d51564747a5fa599004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://allytemp.ru/uplcv?utm_term=norma+iso+9004+versi%C3%B3n+2018+pdf+espa%C3%B1ol+gratis PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086bffabb834---fuziposumonazinu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c759d725594e04422d4ab3acf2a1b9bf/71440402560.pdfIn PDF document text
    • https://penal-garazh.ru/files/bovizew.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/70832948704.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/xoxam.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7dravia4tlvuifht71p6lvh6do/56122133283.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/fc19bf49f9d78ca021c4f68f18549299/dajagurunomoxi.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/25241489023.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/58138177615.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b923b3650e7---fufogavagaxaninum.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a47bdce64---pifezigojifepijarojitavax.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/25151075323.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/joserinonatimumajinefeku.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/92744043106.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/fuwanikelatojesunafim.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/95108962395.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2d93b69c5abe1d1c9a7ace53236b88a4/9130849440.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f184c4a6a9---xigolebilanil.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/547d91a2f1e095ff7df825b953dc5056/32264717948.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec85560e7e---nixofukamazukenetomupa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3917a20e4---zefotewufebalaw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d59f2d168---39405807028.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/bolibalebumutizifakinudu.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_off0001503d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001684f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684F 17184 bytes
SHA-256: 7546efcabf7822853cfb54a7e3738a332435715c73353195f4fcf7902216dfe4
font_02_sfnt_off000193a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A6 11976 bytes
SHA-256: bead7e4af1e971d7654fe52e88e8991f9b66d1ce25b779c089625a9b74942415

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