Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4bd69890aa4159…

MALICIOUS

PDF

100.8 KB Created: 2021-07-19 14:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa44b12abb8136fdec62edae737e32f3 SHA-1: 638eeb9fc13059b6ec8d76862878a4089585265f SHA-256: 9e4bd69890aa41596f8b366659f9eef1264cc661988577e9a1d3769d4fda82c2
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d5c0dc9a---72003848955.pdf
    • http://kipia-nn.ru/userfiles/file/64407178572.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/05a9e4fa8c61dccf33dd5cdee1070578/fawuxomixiz.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c400c530e86---zugexuxuxodajefukefuwu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d336189ea5d39dd024e7eff97cbedfc7/sujunekesukejibufubeko.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093002a0764c---sinelobabowo.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160724f041ba8d---85118720562.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a818cc88662---36579277837.pdf
    • http://au-coeur-du-temps.com/userfiles/file/74417130224.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/90c321bb9d1369dbe0b94a23d6a1ea5e/42875012374.pdf
    • http://raczcsalad.hu/files/mamexo.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db655343e---xumezunupajapoluxebe.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/57469568709.pdf
    • http://zgic.ru/!upload/files/73760798431.pdf
    • https://allmassage.net/upload/file/20210513110010.pdf
    • http://terralis.eu/catalogue_dynamique/file/bujijakol.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b95862ce7e495b89738801566d055a80/diripimozenikevexawamof.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q5hg2mj7ngpfircst4akhqg00u/80160327650.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/03597040460ea46e636d38b1d2e4c9f3/kitagafe.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03d630a61---59116861509.pdf
    • http://usa-ex.com/vogubexijisof.pdf
    • https://akproauto.com/nbloom/fckuploads/file/nawapef.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78d30fe2d---66859400721.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hoopa+clash+of+ages+full+movie
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe68.bin
539b7f0d97bb6df435ea6f9aa4bc16f470f19978b811b4c102e94c7423f02285		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 10780 bytes
font_01_sfnt_off0001173a.bin
d28a8ba9ed9a1915f27a385731602d3e062fc189170a3496b7a49275abb4b0e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 2844 bytes
font_02_sfnt_off00012343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
font_03_sfnt_off00013b55.bin
996d6edd582e93dc353639c92616ff0153d2884acc53a2b67d2584f4e6533c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B55 20528 bytes
font_04_sfnt_off00016f16.bin
cc18dd29c0e954ccb64aafd737ebae4efd7f61c45ca6cadf77ebf227b688c97a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F16 16208 bytes

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