Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ea639ae6848359…

MALICIOUS

PDF

75.0 KB Created: 2021-05-29 11:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4cfb1b58dbe4205b5afe9b66438370 SHA-1: ce218ad5dac424e611fbe421036b52b028b1c2c3 SHA-256: c4ea639ae6848359c165ee5574f3ae5db54f4eda0c81aa3703d4a0376d8ddc48
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body itself is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c8a0b082---palipilakelan.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3gqf5etn2gsp081r4gemfq08c1/29686131909.pdf
    • https://condicionamentofisico.com/arquivos/file/94732360901.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160744a6175282---napotuluf.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d2ce262---wemedesipaba.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f7ec3c83b7b709e9a3f95d48cbd84fa0/5891080374.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f08b9c906---pejudemepivawavul.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dsdbhlo62gictlu5ltvprg7bt9/89909203382.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8d4dcb1cbdd9933b3013c07766006f24/fodevulatudigereb.pdf
    • https://bandai-k.com/userfiles/file/93596140458.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c0ac80b06e191bcec15439e18e5d2925/42631561384.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sgpai24g116suvtq02utg66ffq/lirof.pdf
    • http://tunglamgarden.com/images/fck/file/19714901786.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce3410dcb---xajewasotovapagop.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/58d630bc60cfe9a4b543557bc2318429/84979646746.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607416b1207d2---rusuralizubuvuwigomur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ejemplos+de+monomios+binomios+trinomios+y+polinomios+resueltos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70d.bin
1a54b7b715bedab09e82cd5500252db7f21c1374a0df9bb062f02aa34dc2bf08
pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 5168 bytes
font_01_sfnt_off0000e886.bin
b388dbe1581020506c7ae236760a4eb831b5776da7a7f06160d2be54530fa78e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 6124 bytes
font_02_sfnt_off0000f86e.bin
380bf16266a7fea5ce944ab6404cec145a8f5ab9d797a0e532399a5bbb4934e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 11352 bytes