Malicious PDF — malware analysis report

Static analysis result for SHA-256 10455678c02fa26c…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 08:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2a382e566fa5ab5e5bb34295d3b62c4 SHA-1: ca67cad09e6f0273a2b111e69e8bb53e4da7dc60 SHA-256: 10455678c02fa26c18ef78483695d54d1cd48bdd0a7b00625ee5fc7bd6b8cae2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nc4vemrri1se7jrl32d77f537f/somopafizilufisob.pdf
    • https://planet-pvc.com/upload/files/vaguzajadirakigobeb.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c9c3b143c08182276e0266a0e9d69ef8/kuponuvig.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceee554935---ziwepidewew.pdf
    • http://e-cluny.cz/UserFiles/file/49430541649.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d83c79fac---69281730338.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/51bb661c9e6c6ecea4ed5c776b84a6ba/64634102149.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078460c39a2a---xojobewagabaluj.pdf
    • http://antwerp-reefer-tournament.be/argt/files/67776960321.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b254845377---dorutavafasixol.pdf
    • http://flirdining.com/uploads/files/31366384764.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b1ce7fd7a---44745166595.pdf
    • http://atek-ent.com/upload/file/gonigevuk.pdf
    • http://jfkanacon.org/data/userfiles/files/madadujopoxupularekogejol.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fdfe0062a---gebulebaduraxitilubikow.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/25600722160.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/vng67sgqa71f9ppdk8aqu47p0c/35196920617.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c445ef8cf276c302c7087283a2a5396b/60985067749.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/kowarixejutumi.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a7u6fb4v1l6jmmdcdemrh0ma75/69972114585.pdf
    • http://sushigonewildtogo.com/uploads/files/72115136555.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847744851e0---seratefuzikivemul.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7102923ace428baf18085b2d91785e09/15423655328.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd918b35e2---wolofupefoj.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/790211c197e6d59e184bda5933590cfe/pumizapunaw.pdf
    • http://yuemeism.com/uploadfiles/files/gedizifid.pdf
    • http://russia-ex.com/dawapip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+molecules+of+life+physical+and+chemical+principles+pdf
    • 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_off0000f960.bin
9d503856522e070038f8ecfd29f098267ee3b5180c8ed5300dd3c1c656b16f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10964 bytes
font_01_sfnt_off0001129a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 16792 bytes
font_02_sfnt_off00012aac.bin
1054274f0740bd58c28d635949f4f131a682e7318a7c3822e49a43446c4b9d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 18736 bytes

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