Malicious PDF — malware analysis report

Static analysis result for SHA-256 56aeba55e1d37b59…

MALICIOUS

PDF

94.0 KB Created: 2021-07-17 16:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9937f209c76d18a249b524cffcb2d46 SHA-1: 71d3f0412ca109936b9204d0978fa6d859fb36aa SHA-256: 56aeba55e1d37b59107d42d38819c2de366c2ce7afa7c8f43a88044c4d598e9e
156 Risk Score

Malware Insights

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

The file was detected 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 storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms strongly suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2381d87d3c9e8b516e6525cfe397f276/seporirodusa.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8183e772fc---76709206201.pdf
    • http://dfh-consulting.com/userfiles/file/26729526828.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928e22a84d1---30586946268.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b90db6cf3---1209261544.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/cegho5j6ce2o456h33hle92r3l/sugagirujawegibu.pdf
    • http://stpatricksreunion.org/clients/84553/File/pulizadupupiw.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c583977bf3d---70595203001.pdf
    • https://wecareprogram.org/images/file/fesobavekodi.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e53f0ccfc84f01e26c9d4f8eb8db0591/20347328483.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3d79dc691a99e95004b1db1f61de82fc/52949033183.pdf
    • http://crocepadrekolbe.it/userfiles/files/diris.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877953137---gudugokizule.pdf
    • https://bmw-zona.ru/uploads/file/remezelekibitikanerowot.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c192dc616---93570472297.pdf
    • https://kar360.com/resimler/files/zoxasugir.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/72ff926e04ff7fb5609ebf1c25011bc1/74645405301.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a90a311ed492f76deba0df8164ed5ce9/55657998447.pdf
    • http://freeski.hu/freeski/file/91893714637.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tqi1j2oe6mer40fb36uf1a7ud2/57450062257.pdf
    • http://zhengfutz.com/v15/Upload/file/20215262253274329.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b822784ce6e---litetexotadema.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8186140e6b---lebugi.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/49933748617.pdf
    • http://shinies.ru/img/lib/file/gijev.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3a7023df59e4da5c2928dd0f13a595b4/38795124650.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/wotudepukoxekeje.pdf
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/felufoza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sell+your+virginity+online
    • 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_off00010e6c.bin
cb1b82bcc39b3c5143f97e5250c3b3f04a8b860998ff3da8796a863b453ef1af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 10308 bytes
font_01_sfnt_off000125d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 16792 bytes
font_02_sfnt_off00013de5.bin
d00db47a2b4922d0d5cc2f6928c9f300eddf5e2c638761ecca8239c81d63e0b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE5 17192 bytes