Malicious PDF — malware analysis report

Static analysis result for SHA-256 d547a4584a519cc5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 21:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a48169c2fb707dab9624c639bf04f41 SHA-1: d0be176d7b613b0d8032cd92759175c0d8e4ee14 SHA-256: d547a4584a519cc556e16137d8c52db752e352923ec2f72ebe97cbe0d81fd689
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161283b780fe72---7049721515.pdf In PDF document text
    • http://dongphuctqueen.com/upload/files/47657594667.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16076678973bfa---jorojeji.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/4339478460aa61367ef67.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/69cc79ee146f6cbb0c10464a976868f5/21946652400.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/38828730003.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c16123471---regusuranimexuviwo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/fejabezamifere.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/zozuwes.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e41783d84---36914209918.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/vizemader.pdfIn PDF document text
    • https://matrixx.lu/images/bapimapuxufanemaxoxidebor.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/12302665889.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/55225493405.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/bawadigiboxonanujufak.pdfIn PDF document text
    • https://sanagustin.cl/files/xurix.pdfIn PDF document text
    • http://pi-consulting.ch/download/47533018355.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd83eebf6c---xuvotixidol.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8e869db937fccdd59f9607137a63728c/madasuforumaxivibisuwex.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/20475027509.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fc7bee6a9a7401083bdadfa6b2b3f1c9/16746006517.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/88035451929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nonlinear+control+khalil+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10616 bytes
SHA-256: f133798a7f29a06f33c6c9ce28b061a91782cf73454e790a1f52b3d624cbd0d7
font_02_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 18436 bytes
SHA-256: 556e2b23d91c2e96be0001ade4cbabc18f190da6e5b8917cf7cb2fea14e51b32

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