Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31d29b05eb8cefd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 19:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d901a0fc2fdff104bf8d271dcc95d3ea SHA-1: d0fd2d20fb2feb2d8d939546bd15bb39868137a6 SHA-256: e31d29b05eb8cefde5212148e99480b973f9af550c747ec88ae1050de1e39c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs on disposable or compromised domains, which is a common tactic for SEO poisoning or phishing campaigns. The presence of external URIs and link farm heuristics strongly suggests this document is intended to redirect users to malicious sites.

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://8njl.com/userfiles/files/gatifeti.pdf In PDF document text
    • https://laps.pl/userfiles/file/97859925328.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90322527033.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/17999653103.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/23731522172.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/soxotudupujilolipabufat.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161396b71dc151---79476534633.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nokijatokabatewa.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/60449030206.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/wofaronuwogakubelunaxe.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/83824465957.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/mabatanedofulepuxuzukege.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/62632347379.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/wazaxaxomajin.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e1337c16---88030451092.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/34630690559.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904ce7af24---56435816456.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/degowopexat.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131643bac07b---xepafixorusotifanajuj.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/24917689430.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/zaliforanajonovoxakifete.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/javutotibofe.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905060019692053.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/nomugek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=persona+3+female+social+linksPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 17380 bytes
SHA-256: 009d397431b9ec7b9e615acdfa5deb7dd1ea0fd0ad26d065861869145b84ebfd
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10664 bytes
SHA-256: 6ba1c4697f6a8856b5db6f956785c924a52417b3f92bf115f907138ec0531117
font_02_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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