Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae6d830fbe22405…

MALICIOUS

PDF

90.4 KB Created: 2021-07-20 08:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f43b8ba8fa9bdb1099f01dbaf50ff9b9 SHA-1: 92d1283d40a1a3b3d0912258f2e2d94cf63c1fb9 SHA-256: dae6d830fbe224054e05bd75cd411e66b46e8136753e8d37103034ef616c76f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d30f82314099f507d0436bd957371fd9/patab.pdf In PDF document text
    • http://madmojo.com/fckupload/file/54938506729.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/sixekuzulalopogo.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/73553214709.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bc2950c0---dapufasujomilatumola.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/31346782414.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/muvataf.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pewivaxatazuka.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5j4sc4ke91l2p9lvrgik1vvha7/gekubunibuwufusoxazanadan.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ecf85fbebff8a3affafbacb76c0515e5/lezizufupiviza.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bavewowubodevesot.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/31386926922.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6359e89dd3---99240439875.pdfIn PDF document text
    • http://allycatering.com/userfiles/nabopasaxiruli.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083889d61f61---31150982817.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/98407680504.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dikex.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d20aaed57c5---61677427879.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/neloxexososogasewiwuzesoj.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25de1242c---86972920105.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/pokivas.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f583f924---midogabugurub.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6af740200---52242351036.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/gewerekilazusiwezowixa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088834f5a75e---xuxafeduvawijezaxafit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=natural+hairline+malePDF 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_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 17356 bytes
SHA-256: 0a3cf0e7414a8af8234fcfdd6586939d65cd099d36df1d91045e7c93ac6b11db
font_02_sfnt_off0001447f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447F 10160 bytes
SHA-256: ef20743bb5a7947674bd47e8285be72dcc92eb991111b65739791e125873d467