Malicious PDF — malware analysis report

Static analysis result for SHA-256 2847391fc4e522ab…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 00:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c046df07998b25d5e4f9f9748c8686a3 SHA-1: f9c5c0a5c20f9de3dc3b2aa7416681c76a3ce7fb SHA-256: 2847391fc4e522ab801f0fae586d77bc9f7097bce40a9b43e558e6e43dcc7cea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882d9d0b8ef---56752841563.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b307bb16faa---musetisekirejo.pdf
    • https://stijsr.com/userfiles/file/38070468018.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09563934a---99766779239.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14d4a6d5e---fokazuwulesukurotemip.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b8cb8bca---89480407525.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/790d86fa83306b9722d49a786281c888/wiforafapoboxatazofipi.pdf
    • http://pogservice.ru/userfiles/file/3440994001.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc00800c2---80325608444.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11990181609.pdf
    • http://wurbs-hanau.de/userfiles/file/kejazabovesazowapurod.pdf
    • https://signika.pl/Upload/file/63595600344.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e04aeb519---53224838999.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8f4f34b1b---54717392085.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5355e823e---jubiwijed.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/pabomuk.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/jikilevovebamifa.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/94mt16apo9s75i6sk57qcgbhkn/38224277661.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c608cf871dd---84443100402.pdf
    • http://phuwangnam.com/user_file/file/gijogebulinebode.pdf
    • https://corpusbg.com/files/fck/file/gajoxeke.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2fted02j24ju928fpjfefns8qu/16551091713.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/2533409608.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/o0ialavp8bfgrife2oecrtb558/gipaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gba+emulator+android+roms
    • 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_off0000f11a.bin
7b2d0455feb6f022adec170fd3a9a160ea0b6f1b515320116f39fa676a5b4c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 17596 bytes
font_01_sfnt_off00011f16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
font_02_sfnt_off0001372d.bin
523aa754ac999eacf2dc319d30287678baaa6ea046a8dd9bbefab9a67b5033a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 10688 bytes

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