Malicious PDF — malware analysis report

Static analysis result for SHA-256 517c6d6790f14b90…

MALICIOUS

PDF

77.6 KB Created: 2021-06-28 21:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c47296cc74c23f5354cc4f04874e753 SHA-1: 1122ee0b471e72c0ee5c7cc3060206a3deea518b SHA-256: 517c6d6790f14b9052448843a67df8ec3cfbbef67b19ec924afb54000a7613a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the final malicious destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f7cb9adb---39883541482.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/01ddffd6589fbe1a76e526fa9c9b0cca/rowujepusune.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa1b8cf9f---soroto.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8071cf2f---zidafiriketevegag.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4f402aa4b284dea229b2834c1b844dca/40054508092.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a0487bf228a31f5810ee0c39aae59e39/20938898274.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715badad4d3---60919633922.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c3b1f49e7e3150531bf4b4c988e77109/49552739046.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667bbb682a---pamilalakikakevox.pdf
    • https://divinenine.net/userfiles/file/bekarixiletaxemi.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969de287c8d---sepaxoparunagivor.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kqgku7137foid8vsglvf73q3gj/70510906315.pdf
    • http://a-swiss.com/upload/userfiles/file/625459828.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a309a324e15---71157246308.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a768e8aac3d---84666247247.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080aacf5d006---lemiz.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607687851a49c---jupojonidakonofa.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/359ec4fda8939a017ca48dbdac3da9e8/bumewudifokukodotavagoxef.pdf
    • http://ahxxzx.com/userfiles/202105/file/98654849226.pdf
    • http://autoscuolepintozzi.it/userfiles/files/1036640623.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c30533b10---98485326393.pdf
    • https://allmassage.net/upload/file/20210524115902.pdf
    • http://duancanhotot.com/upload/files/loxikuwogiwit.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/9428856023.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3db6129ab---71863644407.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=to+put+on
    • 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_off0000ce7f.bin
da873eb3937fa1e08a74331932b93d0c3106b15c3ad31127c571c02acc5a5656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 9608 bytes
font_01_sfnt_off0000e369.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 16792 bytes
font_02_sfnt_off0000fb7b.bin
7c2bd3349666ca264c5b936b39c703b3e44b5918e11c24fe7dcddf5dfd35d597		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 18240 bytes

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