Malicious PDF — malware analysis report

Static analysis result for SHA-256 b224f9b35dd90573…

MALICIOUS

PDF

86.0 KB Created: 2021-08-16 04:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a93920f6791ca8a96759a5512e2db06c SHA-1: addcc7ddf4fd0f80ee47c8a65c01b67b8a4a2028 SHA-256: b224f9b35dd905733ecbc31ece4dd832ba6aec3f98b38abaea63f17ad68308ed
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm characteristics indicates a likely spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://at2-turbo-j3t.com/contents//files/wupuvinaludarixugo.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1f2db705cec4020e1ea687fb133165f9/dumisilawanirivazevog.pdf
    • http://americasbestwingsbeltsville.com/uploads/files/juvupukotufifurujeme.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/49693693781.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3d6ef1d9---worupiweluguwigekusade.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb49d27e91c---32558161224.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/42245261106.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d51927497b136a505577d23b11038476/nubaginutebozoxe.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jvglcu4uavo2qfaavtvmk44c7s/tofepo.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/g1br31p4pseetbe7umsop40j5b/fowekutilofaweselefa.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f7734bc6121d2aa24f6664bd9c535384/44312991225.pdf
    • http://vstarmp.cn/upload/files/20210727_202014.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da975da2398b99b91e51f6cd428175c0/jiwilifuk.pdf
    • http://www.jindatunnel.com/up_files/file/24715027111.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e021faba68eccacb141f7003524fb73c/90743957378.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078993432f2e---moginagubus.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610600a3175f9---sewasaledanibazo.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/9mim0lvi0cfopt013thcf4apc2/18495433427.pdf
    • http://moestuinwebshop.nl/userfiles/file/75647623284.pdf
    • http://stark-tools.ru/images/uploaded/sinuxipub.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/61683a4bae67ee58074a295dafe26db8/momanodumazofujidutaf.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/da49e50f8d447615afc2ebedbdb60ed7/14466181735.pdf
    • http://hydrem.ru/images/file/51155365146.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bpqb1vlqjl1kotmgp6cjkl0ta4/temuneg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+redeem+minecraft+windows+10+for+free
    • 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_off0000edd1.bin
60278c6a5f71664d4f33b02d2a33e8a82f474b68a1eca48a8b9ca2a2b9b1f6db
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10844 bytes
font_01_sfnt_off000106eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
font_02_sfnt_off00011efd.bin
7c7e1806271dc73224b81776ccca483be8cefe341949a14c1d872d67c4acbbf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16780 bytes