Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aecf64ae4d9f0ed…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 01:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7619cb2a1bdc57982bbde339fd82bd9 SHA-1: 6c236000d2cc94af207b6bfa51c68fbc3ab9dd63 SHA-256: 6aecf64ae4d9f0eddc694f9ebb85d17d2292fe9f0f2c8dda0ff964bef123886a
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 other PDFs hosted on compromised websites or disposable domains. Heuristics indicate this is a link farm designed to lead users to malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/00c91fb2c258ffe061e609914a47b504/guzogi.pdf
    • https://fruitssupplier.com/app/webroot/img/files/batatudumijafer.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/69109491511.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee0eeabf7---rukidoxijejebus.pdf
    • https://serihosting.com/calisma2/files/uploads/sojukepokuzepiwemapuri.pdf
    • http://top1np.com/ckfinder/userfiles/files/muturitovo.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2478ef680f0e48e554ead7c42123da06/bubelivuli.pdf
    • https://mobilaide.com/upload/editor/file/29286406930.pdf
    • http://vetcasatenovo.it/userfiles/files/ruwemumozosokolepe.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/tomativaxobufuxuzuxekum.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/30192626025.pdf
    • http://conditum.nl/userfiles/file/gorolaxizarefufe.pdf
    • http://architettogherardi.eu/userfiles/files/mozimiketademawofiz.pdf
    • https://equantumconsulting.com/files/files/bamofutipebupetemuburufig.pdf
    • https://stmarys-perthamboy.com/upload/File/53660383680.pdf
    • http://bridgeonlaw.com/filespath/files/20210914022815.pdf
    • http://mprime.net/ckfinder/userfiles/files/fikivazesi.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/92e82c92bb194b10e10d97d0e7b6e5b2/56187286502.pdf
    • http://fishingas.com/userfiles/file/14671461505.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02ed38daa---43014897863.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/98671716058.pdf
    • https://bestrecycledautoparts.net/images_i/file/24815957233.pdf
    • http://morpheus-architects.com/file_media/file_image/file/tudul.pdf
    • http://instit.ac/ckfinder/userfiles/files/miwenon.pdf
    • https://bangvetthuong.com/luutru/files/basipu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=skam+bloopers+season+1+episode+1
    • 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_off0000d8b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 16792 bytes
font_01_sfnt_off0000f0c7.bin
b38446d691594fc2f3da20bd7d694d8187d46e4e5833a200af24f04eb592f414
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 20520 bytes
font_02_sfnt_off00012707.bin
b80e65b61e3217e7dc55f257de55dad08eb16c8115330b3860d5acc56e58c94b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 10812 bytes