Malicious PDF — malware analysis report

Static analysis result for SHA-256 d612ac78c94f66c8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 17:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dda55a34273d8f97fa83b04350f40b8b SHA-1: 53e3bccd3bb8e0b9a777d418d15613cd518d9cb2 SHA-256: d612ac78c94f66c8ae5fdee87d083b818aa871152da88987ebb1b5a25f5a20c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are part of link farms hosted on compromised or disposable domains. The PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the overall pattern indicates a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=game+aaa+android PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/199fc5384aa65f63df878386d8fd22a6/9855971369.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pavivisegonuxobiziwalik.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/29185519084.pdfIn PDF document text
    • https://chineseclothingonline.com/File/tutenudubowuvugajotadebor.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/85646353295.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/23784452653.pdfIn PDF document text
    • http://sayarbobinaj.com/file/93676372384.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/lewowudababudanuwomilo.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/29284376892.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16145c535732df---37454706226.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/bimifawido.pdfIn PDF document text
    • https://majubesar.org/contents/files/6278045265.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/zenamoju.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wateveda.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de76a6c35---58096033825.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jotogogazuja.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e181f77fbcd961346f843085472247f/55366866586.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38de7ca36---zajiruzawunewavusolu.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-18/20210918061123818774.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/60268998246.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/70hvr6708ljtaaqvi5pmerda51/2573175229.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/nawipamotogug.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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10136 bytes
SHA-256: e855c86bb45e1c7c74e68281e7edbae7b31d481c1a87e3b61227506e0fc7b2a7
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 17268 bytes
SHA-256: 89f0a32d10ef81428d1ab18c09bef727e75e5e9cdf2b0b0a66c4ef2efb8a5d72
font_02_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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