Malicious PDF — malware analysis report

Static analysis result for SHA-256 396168976636bf35…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 13:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bae17f1f3bd4f0eb5f8120342c67e64 SHA-1: 664d1b4dd0c231239fb15a8e38f6f76f1065e559 SHA-256: 396168976636bf35861a5de1e1102c17eb7c8806ab9ad7216115b49d94e453f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are identified as link farms pointing to potentially compromised hosting or disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a deliberate attempt to create a network of links for SEO manipulation or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=ff+apk+download+for+pc
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dusabunesupafelisam.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/42019043313.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/8t0cpchgu1ectft6p0stecg4f7/59706633258.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/rukimaloxapije.pdf
    • https://dcimx.com/files/51223828033.pdf
    • https://biomisszio.hu/tmp/11926917256.pdf
    • http://livestocktool.com/d/files/velefizuzisupedamogapalat.pdf
    • https://t-groupvnxkld.com/uploads/news_file/kekopobodike.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/bepirenenan.pdf
    • http://musorcentrum.around.hu/files/article/file/xoxutobipigufuw.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/6725737741.pdf
    • http://multi-accueil.fr/ressource/site-image/files/7189873533.pdf
    • https://newtech-utm.pl/userfiles/file/vozalenokonaluvi.pdf
    • http://medica-brno.com/files/watasezelipazusoduxu.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144db2078f02---kotumizigilujexurapa.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/tidebopajiredej.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9dvuroeu0438hs9t95vfqr6p97/vugibuzogotosisezivogiz.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98622031106.pdf
    • https://namkhoasaigon.vn/web/images/files/93232580034.pdf
    • http://nova-auto.com/upload/fisubazoxafijonunonegaj.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/ravimitami.pdf
    • http://jamxmpharmatech.com/upload/files/94954339959.pdf
    • http://aranykoronakft.hu/userfiles/file/25083446194.pdf
    • https://istanajp2.com/contents/files/disiledu.pdf
    • 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_off0000d7e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 16792 bytes
font_01_sfnt_off0000effa.bin
ae22d207fdb7d0aa11b3e6ef3129728818739feda2f52fd7c883ec5d8fd2e56d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 18368 bytes
font_02_sfnt_off00012006.bin
ddff55756948b3e166e6acf2b48a8675b3db72b507dea29975c1b5a2b8fa7840
pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 10280 bytes