Malicious PDF — malware analysis report

Static analysis result for SHA-256 516419bad4e47118…

MALICIOUS

PDF

97.8 KB Created: 2021-07-12 23:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7355f5c903e8a9b5e4c217d692094c82 SHA-1: 26d1cac90122c82b1eab857fb574ef34e25cc205 SHA-256: 516419bad4e47118b5af70f2ee2ed24688ccacfa2f9e85990cd32051fabd853a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://bielwod.com/userfiles/file/24834529875.pdf
    • http://adria-ex.com/images/blog//file/jubodelakorimafa.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210708092236.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3c32f082a132bcd117007af0751d29a9/nugenitovotegireliwenuj.pdf
    • http://montaze.org/democms/userfiles/file/favogu.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e8cdfe0cecd8327e1b913ac0537be7ae/jafuguso.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/66603977389.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/95208a73387e91f5c2d02d48ba4ffe33/beridiwipak.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e20a77f50f2f7fc65ec61bb3fb56e00e/88332808709.pdf
    • http://prime-standard.com/piceditor/file/lomojezum.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/givenaniv.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/43610ee6a5abe6c368e731855c273450/votetusosatipaja.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/394aaa0dca59972175092a4d7fbe629f/94531769313.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b33387bd09ad56921c28f144b667477b/satowifefuxufudinoxewokum.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27525946fd---44585841052.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17c44f1129---83681298469.pdf
    • http://al-farh-iq.com/upload/userfiles/file/37026196694.pdf
    • http://yfatc.com/userfiles/file/nuxuwifovivanakowete.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/fabivovofamobomibux.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42636c1b9---mameguxejivojusutufegebef.pdf
    • http://partnerplus30.ru/images/fornews/files/68966757753.pdf
    • https://lawrenceyezersky.com/userfiles/file/logomifuxadonomomi.pdf
    • http://coinmarketsuite.com/ckfinder/userfiles/files/gebunowerivuwuzevafor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=chariot+house+of+the+dead
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bb.bin
fd7882c78ae7dc9e059cb17d703ef38144701c00d08867000689a0399c14661c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 10432 bytes
font_01_sfnt_off00011194.bin
3a4d9d69cd63c8e0c8cb86dc7e4453fe7f1679d0f4689577bd4f7e0f6ae62619
pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 17420 bytes
font_02_sfnt_off00013fb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB8 16792 bytes
font_03_sfnt_off000157c5.bin
548c93cbcddc54dc335eaf21fdd36c15faf21c3787f5dfbc0a08a03164ff4d82
pdf-font-stream PDF embedded font (sfnt) at offset 0x157C5 2676 bytes
font_04_sfnt_off0001635d.bin
fccb4a0d2ac9a8b0591e8138f030f210eb4e6f4edb6866e048ed942c0b2fb93e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1635D 16224 bytes