Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fc750ad1d46440…

MALICIOUS

PDF

88.0 KB Created: 2021-08-12 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6b465fae07692124200c4571209d270 SHA-1: c436378b10ddbd51e94a6c04f230942d03a7aefd SHA-256: 74fc750ad1d464404d190583c31c5d2f9d5b137337447d0ab265e859db9f4ede
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to potentially harmful content. The presence of these links and the nature of the hosting (compromised uploads) strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f9c75099---86006850572.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/62bb8e433bff7213c2171eb420599385/23503743992.pdf
    • http://bertolinacare.it/file/28545235181.pdf
    • http://twilaw.com/files/files/zafepepuf.pdf
    • http://avatars.ru/userfiles/file/90291466710.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/10968570002.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/tukekebalaxobiguroxixen.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8573f237a4---77682674148.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bd9054b8abbb0f1347f24aaba7881af3/zelares.pdf
    • http://files.ibiza-ferien.de/file/70664248208.pdf
    • http://www.firengo.com/userfiles/files/48748000124.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/56125362145.pdf
    • https://ikitellirezistans.com/upload/files/banesow.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukfski1hspeh8niab3gc9sieuj/92771455459.pdf
    • http://derma-dts.de/files/file/xokitesa.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfbfddb42d---wovupibetin.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b575c8d7---gejaju.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b966a1f231d---94652533569.pdf
    • http://st-ark.it/userfiles/files/41449435436.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec54c4f18---wiwarogunutogafab.pdf
    • https://gerastar.com/userfiles/file/84963314686.pdf
    • http://cs-golfclub.com/ckupload/files/perepotaf.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c41d91012---gudoxodudonozebibikororo.pdf
    • http://cokhitienvuong.com/uploads/files/tovojazusibuzexavuziv.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mjl34rle2fdkmch66hs8o3cq5p/gefixaxaxitokabujejufopew.pdf
    • http://katheran.com/clients/55933/File/73677626042.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+deal+with+conflict+interview
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f617.bin
6914495b504bf138f9bb5752b85388b8d56159f4c3fe27c99512c657fb401bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 10548 bytes
font_01_sfnt_off00010e07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16792 bytes
font_02_sfnt_off00012619.bin
f435d75599beee673df14d407d546f8d214085dec36a003a05bdc68459c1f6d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 16892 bytes