Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4094c07a2bdd80…

MALICIOUS

PDF

95.9 KB Created: 2021-07-04 13:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 831cd2c6b19a4abcf4f815bbae32aab6 SHA-1: c602f3606957a2f386612290ace22657b24d4ef8 SHA-256: 3e4094c07a2bdd80d873f0aad36c203aaaaa72bd807fb349b45489cd171c82a4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 http://erbamedica.org/userfiles/files/limetivegemo.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/66j2ibiljm5am29lgba298osfn/29603198270.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3963a00914---zipevotisig.pdf
    • https://satybharat.com/ci/userfiles/files/49927662111.pdf
    • https://metal-et-verre.ch/ckfinder/userfiles/files/7878360489.pdf
    • https://mavachhaiphong.com/upload/files/59798590164.pdf
    • http://reguitti-engineering.it/userfiles/files/nimukinirupubozenasegudub.pdf
    • http://archi1919.com/smlclub-files/file/xajetut.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4539bf2c20---65662519648.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79972c9df2---69532014366.pdf
    • http://paoladebenedetti.eu/userfiles/files/19712650027.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cede4d5030e---79937342458.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae86d7d13a---sadexisaditibixigiv.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/69065269278.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/66a67ce7a97dfe24e8dbb45697c8b3ac/botaradidotede.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086d41cd1848---58894519321.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f785ac735d783e0ee4d18d20920a38e2/86396100147.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1033a342d---xuwoxezezituwogoviso.pdf
    • https://dm288.rs/slicice/file/zusalufugevoxuwag.pdf
    • https://netshopnepal.com/userfiles/file/xiwiduzivude.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd31f76152---pupodutonedosejif.pdf
    • http://cl-metalparts.com/d/files/madawubuxagaferakefubarin.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/27503d4a3d41d370ff1153219cd3561a/23491998163.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/42440b86042c125f8e91a9a989038cd4/94960659990.pdf
    • http://jessie.vn/images/ckeditor/files/94351710271.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/11200722035.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=features+of+low+level+programming+language
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 16792 bytes
font_01_sfnt_off0001125a.bin
f69eb9ae5d5ed9749173af1918e8f93e654d37223a3963e84665663bc7be9804
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 10928 bytes
font_02_sfnt_off00012bb5.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 16392 bytes
font_03_sfnt_off000141de.bin
c1e90844fed699c03f8fdd0a9a34a553861bdcbe0a265fb8f5947804cd156b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 17488 bytes