Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cc37ef4dc78974…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 02:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 128886c05a0a0d6aea51fdf84ef3e654 SHA-1: 04be17c57bb224f55f03d5f92b7fb48fe13e420b SHA-256: 43cc37ef4dc78974618c9123776b46ec15ae52ffd666a57d856dd3f787676185
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The presence of numerous links pointing to potentially compromised or disposable domains, including WordPress upload storage, indicates a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spec-so.ru/sites/default/files/file/nibimabimesagowozevixob.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee37b0b0e---rebene.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xumazowaxobobajilo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc0d8e9df1---61133330670.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/natumex.pdfIn PDF document text
    • http://clingac.com/d/files/42083391560.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c8d5e612e0c456b218c6de7231881d32/70664739525.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/21e871325cec4968c07a97877a549e5f/5208254596.pdfIn PDF document text
    • https://rintrans.com/files/butobuzesasanon.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35b7a8ec3---fozana.pdfIn PDF document text
    • http://dr-temt.ru/images/file/vepaloj.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/35793632326.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c35377a92b35e85e44ec46d47e5ff802/38198226646.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/sovuvupuxa.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/fisusexugexukuvatafudoj.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/84086227554.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/59347390276.pdfIn PDF document text
    • http://omni-links.com/41598755005.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23ba791910---4159379435.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b191aa8a---wanukenamijowukokibabo.pdfIn PDF document text
    • http://underbutter.cz/download/foto/buwumoruvegakufizekez.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/92395193702.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec3fb2045---50643990164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=software+definition+and+types+pdfPDF 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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 16932 bytes
SHA-256: a26afb5492c9f1740c12bad45cbb9a327265e9bdd2903c90cf33f2733e417d73
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 10720 bytes
SHA-256: 8a1dd23184447042773d0b6411597db05f83f10a985d1aacd5c2bd3737c64546
font_02_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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