Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fbe84d881282f9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 19:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6b0b54ac3c4925db82828a358a3e79d SHA-1: 195f25d7d5fed0e1a1b142aabaeb9b03f7b5f339 SHA-256: 27fbe84d881282f9ddb13170551421af734061542524e8b6964140fe2ca75088
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to obscure the true malicious destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coopinproject.eu/ckfinder/userfiles/files/lokoveralame.pdf
    • http://adatarimhayvancilik.com/Images/Media/files/darenivifugapive.pdf
    • http://cuanhuadanang.vn/uploads/image/files/wumorudibixi.pdf
    • http://www.sanjuktabanerjee.com/fckimages/file/fasosukuxusodimej.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9050d576445e8aa1279db3be5f566c4b/27426905637.pdf
    • https://aayams.com/userfiles/file/67107094998.pdf
    • http://tofuyatogo.com/uploads/files/18020468380.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/67686564593.pdf
    • http://mothertheresapublicschool.com/userfiles/file/mutebenavavezori.pdf
    • http://hongpakthai.com/ckfinder/userfiles/files/tibusibod.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/bosakeniludivowowa.pdf
    • http://ecoevopublisher.com/files/upfiles/file/lanim.pdf
    • http://samuiluxurytravel.com/Uploads/file/47455860851.pdf
    • http://ebd.su/UFD/7623/files/gikifot.pdf
    • http://motovelo-nmsk.ru/userfiles/file/xejusajodarelobitina.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0f5e862f92194feb8113855fbbdcab43/66113752817.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/90842343969.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb19c1d81---gilibinowenudapozazumerod.pdf
    • https://cet.sk/res/file/detodisufizad.pdf
    • http://tomaszfilipczak.pl/userfiles/file/6843310008.pdf
    • https://larioenergy.net/uploads/file/favem.pdf
    • http://studiocalderini.it/userfiles/files/todopuwatisimakubupukoj.pdf
    • https://efckrakow.pl/userfiles/file/30124493253.pdf
    • http://hcvitamin.com/webroot/img/files/vedesedosuzotanafinoxosev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=brachial+plexus+and+muscle+innervation+chart
    • 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_off0000e161.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 16792 bytes
font_01_sfnt_off0000f973.bin
b86b5d212f1f64a12adb7fb79c9761d10577f0cc32296a8c6a549206f11aaf00
pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 16756 bytes
font_02_sfnt_off0001241d.bin
67ee9de1cc379bcc3aa8fb7faecd92b277d7c4cad12935edff9403cd9f81b331
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 11100 bytes