Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42af67a4f2a358d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 23:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa44759c0c427bb114759796d7ddcad6 SHA-1: 801e896c413435cc8f8ff1e4a2069d81827bf826 SHA-256: e42af67a4f2a358d8713c6c83277edb5d7580e16f223776a575b0fe3537726b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aqbnb.com/uploadfile/file/ganefigakobabopa.pdf
    • http://sharon-barron.com/userfiles/files/gijerotapafodapexixavedeg.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdf
    • http://kantoromega.pl/userfiles/file/50168164479.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091749264170---49280860088.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d1af7eaf9631e64655a676ad0bce4a87/bonavijiriv.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/zinefobi.pdf
    • http://gramercygrand.ru/files/file/gowuvelaravokez.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3a8f5d613af5a39b9a254e3e98d867a8/87296582827.pdf
    • http://quaint-house.com/images/blog/file/29706013273.pdf
    • http://wskinbody.com/data/boardData/files/nazodatakopedinonofoxezed.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f6a837648856127877084273c20aac34/puforabivaw.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768c87e8aa---44274898959.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09ae81371---wufegojarejulu.pdf
    • https://zemiigori.com/uploads/file/74915695576.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc36dbdbc---27760515451.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8a8173cfadb209bea2f43b84c3e7dba3/boxinasuxomabuvun.pdf
    • http://stellamaris.cz/userfiles/17688755649.pdf
    • http://arslanemlak.com/E/file/22118248252.pdf
    • https://pet-fashion.ro/mm/file/14802373753.pdf
    • http://tetraeng.it/userfiles/files/20485096754.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/bivorajigezo.pdf
    • https://btegypt.com/file/66989583624.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bissell+symphony+steam+mop+manual
    • 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_off0000dd39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16792 bytes
font_01_sfnt_off0000f550.bin
34ec59c4ed9e1db77123a10f542108202e66a5a3c98b1e71e250d9817ae377a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10684 bytes
font_02_sfnt_off00010da6.bin
b516765481de8deffd4c4525ff1978478f752b755e9c265a6463484641e600f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 17720 bytes