Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ac648d44628a21…

MALICIOUS

PDF

89.1 KB Created: 2021-08-27 12:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 238325dd012d57ca11d407c3f6f71d42 SHA-1: 4e4493b58030670289f68d655bbad99557ea2bcc SHA-256: 03ac648d44628a21104d5b78e93ecaed723dd5a6b805f5a778e3496e4ddc6110
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many pointing to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=the+highest+compliment PDF link annotation
    • http://biomassasia.net/data_ed/userfiles/file/6441126506.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/99008c29e4e8dd5e960847c2eae045e5/kiladozabubego.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e2ec5a07a16e0d07c01c9b10ba876eae/52144947424.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/12642818661.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9db15255318cb04fe53bb4ccd133c5c6/45361278765.pdfIn PDF document text
    • http://wwstationery.com/files/file/40885467928.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/beda4b1e05d88ae580783c48b93cc6f0/rawadijowukigifebipapis.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bb902549834fedd5a774e43ab5912c1/figixogizemotemosozu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/84578886751.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/vabix.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/38683351957.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/wakewagifuboradepipiwefim.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8a31c4fb---favigutabarube.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aed3d2a7f6---49678022989.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6dc584b1---83925463417.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b8d72761b---faluxikemajatumopegor.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/82375409313.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088534e504ef---kidezoxipuw.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wirukewogagixironeruloj.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac933d3ac28---wufetelobimakivapina.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6999dd97---kexesokeje.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kivefipadibofisemad.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4u1slopinhm5378h5gssaab7na/16595110440.pdfIn PDF document text
    • 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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 18684 bytes
SHA-256: 20170f3b29fc664cf5315ac6ae43c07d031e28a1a16ebb0af565b00af5e8bb58
font_01_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED7 10520 bytes
SHA-256: f1ca7970e6f2df738d9dab3ee97487638a6b9b11eb828d172ed3549f303bf7f0