Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f037a5c58a59bf5…

MALICIOUS

PDF

82.5 KB Created: 2021-07-03 08:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17cd1b3495dd83add6592ef221113ad4 SHA-1: 6c49f4a2ed99dcaaee0050865a5d912999781f05 SHA-256: 8f037a5c58a59bf59ec19d8bf3263cd9967e7b5e3f52a5a0d1e676e6d58c89bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external content, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://diamond6ranch.com/userfiles/file/24266021054.pdf In PDF document text
    • http://odpadykj.cz/UserFiles/File/32575272450.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/kenegunirobafusedesevegi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/54548906312.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/digukerubigovum.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e74b619b79898288d256a09173874453/28794928625.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b518d33d97c---98677517074.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/fefowopoxororotuzefomera.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/bitimitimosovivinat.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f691d55beb---bojafirikuduju.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/14916180863.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/900350287950e3947a7688e7d365d7a2/77928099634.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/tevebanuborixam.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e605bdbd---tavevepotopoxevidefutijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=examples+of+serious+misconduct+in+the+workplacePDF 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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 11248 bytes
SHA-256: db159ed678d3c563931c888d721f3c5e97480ceba3e81c055a0a730fffda2593
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 16928 bytes
SHA-256: 59fa9eeef79fcaf445a9ec43288a8c142ff4b80e8b079b168ccb8f01cb81eab6

Open this report in the interactive analyzer, or submit your own file for analysis.