Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac0eaf8827aa323…

MALICIOUS

PDF

140.6 KB Created: 2021-07-07 20:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 98e706e594f3fe987af96c1e215989e8 SHA-1: 4d4e24c4cd1063e1f186221ccd5f301b342eab65 SHA-256: 8ac0eaf8827aa323a56db5e79122a1f3fd980925b1aecc495217580c4606573d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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://laborke.ru/uplcv?utm_term=products+of+apiculture+industry+and+its+uses+pdf PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab4d1a0c1---87971315131.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c3fb9l53q026qoo1v6um656rpa/66565453810.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a7f4b95d---zaminitorubofosukiwig.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/7234491950.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/70346278204.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/18325114911.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/15787232703.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073795e31f41---zokewelidewekixobagapodal.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/giwuginexafen.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853676dabfd---39028277702.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/31111270997.pdfIn PDF document text
    • http://bichvan.vn/upload/files/86083521418.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8c2ae9db---kamadinovuburipemidafa.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/60465515216.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/rikowepevigal.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/88384027961.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/c4mo8i3o7o1n9gsa590cnrjv1v/61405729336.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbb9c6a340---45552592052.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c24700d6103b5102d0eb17111b3e426b/pikerubexasevusito.pdfIn PDF document text
    • http://prestopc.it/upload/file/runekumovuvokafejizitupo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074058e3527b---64857839394.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/93317143541.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e73122545571d34a4d9c88c66979146f/darok.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/leketa.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db6c97d75---guvazokugibakodov.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/39877175980.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B293 1936 bytes
SHA-256: 1aab3a35b707987009673e0352d002d8616021798d09fb239697e21b3c9440db
font_01_sfnt_off0001bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB7B 21608 bytes
SHA-256: 369bfbc218f796756b5958016288fa7364f43dab93392ae2af5199247f0caa09
font_02_sfnt_off0001f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F27F 10828 bytes
SHA-256: 1ccf8d3be9de9679d5c4e96b999979a4037f5753a655056df8dcf627c9d52c39
font_03_sfnt_off00020ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1