Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a828c9d7fa524f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 12:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81a332a5dfc8f8f926229208e97f35de SHA-1: 75de345eb2cadcf4ed1912caab706b1f20d6d176 SHA-256: e0a828c9d7fa524f41f7487bcb3e33c69f9ef2fc113d45e7b6c29b84042e58be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm directing users to multiple domains, some of which are hosted on compromised CMS platforms. The PDF's structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings indicate a malicious intent to redirect users.

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 http://www.biosafety.biz/ckfinder/userfiles/files/33598685816.pdf
    • http://mgtofubbq.com/uploads/files/52415154528.pdf
    • https://strategieb2b.com/userfiles/file/57308926953.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dunenabofe.pdf
    • https://boyanbolyarski.com/userfiles/file/losaj.pdf
    • http://mgocsm.in/userfiles/file/6238025429.pdf
    • https://agronlogistics.com/userfiles/files/96746856233.pdf
    • https://norservis.com/files/files/dixiputerajuxetanuxud.pdf
    • https://abbma.in/admin/uploads/file/laditu.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c5b96ef58ed912df2fbecf177e90dc61/lamamoniradazeka.pdf
    • http://cualuoiskydoor.com/webroot/img/files/vonun.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/edb03376560fc0408bb47db2945bde8d/23285479989.pdf
    • https://bimore.vn/webroot/img/files/25025057488.pdf
    • http://delfosventures.net/userfiles/files/seniti.pdf
    • http://encino.kopanramen.com/uploads/files/20352369396.pdf
    • http://mikomisushi.com/uploads/files/rubumaxamasogopebupazuxu.pdf
    • https://manorhair.com/uploads/files/202109052331144756.pdf
    • http://kayapalinakliyat.net/file/14234018409.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e95c92359---nuwusidomabeze.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161379df052636---dufaxumanusixigup.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1353b04c---59966634913.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/vosevoluwinogukamufege.pdf
    • http://dynamic1984.com/user_file/file/25162981299.pdf
    • https://bcm.es/files/galeria/files/tazoxafun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=newpipe+latest+version+apk
    • 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_off0000db82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
font_01_sfnt_off0000f394.bin
d15678c60e8d8853989e0c251b6a8d4a625e80fb16c35dff3af870946fd83f11
pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 18596 bytes
font_02_sfnt_off000124a4.bin
f545ea3ab53c751976021b58e22620c4ae3ff6f2eba3d3811b21a85882d7a2de
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 10468 bytes