Malicious PDF — malware analysis report

Static analysis result for SHA-256 4451d098c322ccf8…

MALICIOUS

PDF

92.8 KB Created: 2021-07-02 18:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdf79b6f5bb92f4f6604249084a94581 SHA-1: 073f78704495b7065b4dc7a64982b06d0a7243f0 SHA-256: 4451d098c322ccf8adf4e35663eaa8534999ee92981a734429b5b406afb8a0ab
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6e136c61d302cbc91ef9f7f287857a57/14644800093.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075c09535116---pasuw.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a42fa00eb---81515299518.pdf
    • https://cgeminfos.ma/upload/file/xalofaxewapalebuvuta.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160716aae06e66---39084290311.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/q1sc58adt5q4lvu1trop9n4nfv/xulawupujazoli.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079950e819cf---pawebazisaxad.pdf
    • http://rhodeislandalpha.com/clients/56223/File/xidamizefis.pdf
    • https://grup-insaat.com/userfiles/file/89261242585.pdf
    • http://goldnumber.info/userfiles/file/76203342920.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702222af79a---kimobetadojilivorurokume.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160960a8b82e57---45297437157.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d315a242---laladumuvudubi.pdf
    • http://acril.ru/ufiles/files/wugezapuwosuzozolar.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026a2958da---36747606473.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926f0a6338---wilidizaxelegisigenawi.pdf
    • http://magnachip.cn/userfiles/file/20210513073258.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093abed52ddf---32879462339.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071be9b7dd6c---mejefumonixuxolejorawo.pdf
    • https://termoformat.md/img/files/25267874920.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+unlimited+money+on+gta+online
    • 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_off00010577.bin
5a34f35014b15ee98c6b62c986ace51eafafef241caf5cadb9117aac34533986
pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10616 bytes
font_01_sfnt_off00011d7d.bin
88ca803c4c2591d2c08b7ff354e3c9792a822f369edf8ba5209dfda1de044e56
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 17780 bytes
font_02_sfnt_off00014c3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3E 16792 bytes