Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8067d20f2b3802…

MALICIOUS

PDF

90.2 KB Created: 2021-07-26 00:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f242bdd948bc0faf503c69e95a41e94 SHA-1: c73709e4a0e87a734a580bd60288e0207a77d382 SHA-256: 4d8067d20f2b3802ed369c096bf99e043af37f6ab48ce26a16e67784b564c02b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links suggest an attempt to redirect users to download further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa5069662---3538898294.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/96b1886d37ce3ba2ef00f73d5c0e7a40/pamikoxa.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/eb0b70ac3623ea012e500b97214e3f79/21939358403.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/tq87igneqp414t5jeg8413mh4c/53570314431.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/22230058298.pdf
    • https://majorsagilekvaros.hu/uploads/file/69336749881.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd610c5580---58754444988.pdf
    • http://mytaylormadefamilyusa.com/clients/864113/File/topenudasukigiginidesa.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b496301190---84737450217.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/26f1f1e3e914bbb119ad6a3086b8d397/tixebazi.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31f78b29f---6841631626.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/79e7d34a22f4ecf13a91931008377b34/89087268747.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6mhn9n22ei720lscuhrcb78s12/80040234668.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vog0nkakbiotjjbtfj17voqknp/18242566885.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c5e73976f682a9a5bffb9c1874c01934/dodumagatorinoxigosoba.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6044248d170f4d341f4688426d40a202/27388324208.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6717d8de540107aff9c308b39b2f86cd/jiwepozalitataxum.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b9951a9c4a8f214ff9eb92dfdcd155cc/nazovidobikukidofuxuwof.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607567cf27b01---fegesajuzodiwegifi.pdf
    • http://kartywspomnien.pl/uploads/assets/file/gebovuj.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61751135a9---43344975319.pdf
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/somulobixalojebozedawewu.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9c41f0789b7feedb212cc13ca59837a1/kakoxajesopirajifobetu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=diferencia+de+bacterias+gram+positivas+y+negativas+pdf
    • 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_off0000f6cf.bin
1dc46d83d4ee40e168091b573c744f799d653a05b08a3fbf7d244b1cf249bae0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 18460 bytes
font_01_sfnt_off000125d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 16792 bytes
font_02_sfnt_off00013def.bin
049ce0f30b362cd7a01052466af4724646de3f9bf7579cc75a0dc5a3fa29bfe8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 11240 bytes