Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ebf457a5dd2449…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 21:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2647cdd61cd2202a779b7440433dcb93 SHA-1: 7fd01ecf1c0e378e90da0d78a78726151ca737fe SHA-256: 99ebf457a5dd24495d21ac6bb667b4c47d33be04e1913a9a6039f8d20fd77d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were directly extracted, the presence of these compromised links and the overall detection indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36acae5803---71622548360.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f67a58584---zoxul.pdf
    • https://moveo-sport.pl/userfiles/file/67636030791.pdf
    • https://littlelightnepal.org/userfiles/file/64052896159.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea2443444---novezoj.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a55c38b43c6a7f8e39804e5fe73376cd/latafidowuwuxovijetug.pdf
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/xepalepapised.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92fe15dd6---46454569146.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6277b22f0---jowudanipekorulumeloxoj.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b0tmi96vp5o01fl1evddk4f7nm/43279056566.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5bb7be937bf7e126a11c9af106f95806/pidorekakuxu.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/070fb3c3e1dca2c65d5685a4a573cc7a/mokojafitafoxon.pdf
    • https://eyetracking.pl/userfiles/file/gewidukenupib.pdf
    • http://asfalon.com/__files/file/tanaji.pdf
    • http://planbmedia.hufiles/sukiwopimepojefoladu.pdf
    • http://sklepjola.pl/userfiles/file/93729011566.pdf
    • http://duquenne-moteurs.fr/webroot/upload/files/lenojinejitefeno.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5cfd309d---46959702089.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d40e50e588b511b7501dcff0aa766dad/55497203488.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/82426186101.pdf
    • http://domeinbeverdonk.be/assets/files/file/gazudugixepekusajudi.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5fd604a239aeae0dd8ca71463c1261c1/penufuragoge.pdf
    • http://faradtvandor.hu/picture/userfiles/file/15943474352.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6b67be00---92301300614.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=metallica+all+i+want+for+christmas
    • 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_off0000dc8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
font_01_sfnt_off0000f4a0.bin
fb7201a78dc32cd737ec0494f363554ebd31a91bb11fd87c9f4b76ad11ef32f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 17632 bytes
font_02_sfnt_off00012293.bin
11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 16228 bytes
font_03_sfnt_off0001387b.bin
55c45e947ff092c08207f2a2ef6d3aea1ffcfca51b7a7e6ba08f421edb3dce5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1387B 10680 bytes