Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cdcf1a111c5228…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 13:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3598c11514c49f21401f00ac12105ef2 SHA-1: d76ad469bc5697cc57303e55d2692fb4a497dabe SHA-256: b9cdcf1a111c5228f728c474bdb01f5a4c7ce76917860865d195f8155d711093
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pb7pvo7hc5r7vllrvn7jtvjge3/8483953303.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613683a248a9e---81251414858.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f521d243a68aa2b528d526c9c3b485ce/89894265279.pdf
    • http://cssh.es/img/file/43316261096.pdf
    • http://vitacanes.com/uploads/files/zikefizajirobakuvu.pdf
    • https://deniz-sogutma.org/img/userfiles/file/24895532842.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134ed018eb06---24859581179.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/44381249646.pdf
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/xomawobugiwa.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/wekowimasesukolalaz.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/safikelekulelejaruzuxene.pdf
    • http://traslochimontalto.it/userfiles/files/lukigok.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/xovuwukofudi.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/wikir.pdf
    • https://gres-k.cat/userfiles/file/73065513674.pdf
    • http://studiorinaldibedin.eu/userfiles/files/85548241274.pdf
    • http://pactolous.hu/upload/file/najodokorufasej.pdf
    • http://starinviter.com/ckimagefiles/danesowulas.pdf
    • http://coreaad.com/DreamDataUpload/file/2354379631.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab5f37512---wejif.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/14962749157.pdf
    • http://lamorenj.com/userfiles/files/25504423542.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc1a73e2d---68225910834.pdf
    • http://parfumerieindex.nl/images/uploads/61705256764.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613701221a915---wufupapibesogo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=root+para+mi+android
    • 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_off0000dcb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 16792 bytes
font_01_sfnt_off0000f4cb.bin
b73c7e05c7bbc88136cd89a2d00c71d5b65f6b83c4107a25ff8967d9218b0f83
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 18608 bytes
font_02_sfnt_off0001255a.bin
469950b16bffca34b1a19732c0f81b13605f150217f36572d805a9df6c1345a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 10252 bytes