Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2dff48e59fc7f…

MALICIOUS

PDF

98.0 KB Created: 2021-06-27 05:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b91255c4550302c1ac3a15de1b69b41a SHA-1: 984025f240b82595e227f85f05d7e9e0156555cc SHA-256: a4c2dff48e59fc7faf1cce06003d1f5880c0cba01b0d6b56a65bcc3e2fc6db19
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://drafthe.ru/uplcv?utm_term=in+the+heat+of+the+moment+meaning
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160764a0f4882c---javasorijarumasaxefixejow.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc4b07269---35571963310.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/91d642179d8085e126269685ac6434d6/15869795471.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd135cae5b5---zolerutareja.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0921be7acd---mafuzijete.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/34289346697.pdf
    • http://spalovnachemolak.sk/userfiles/file/wigutulefisufirofiguwali.pdf
    • https://aimhc.com/userfiles/file/25740994477.pdf
    • http://byty-pardubice.eu/UserFiles/File/zuzamomaverolotoxajipoxen.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/289b092d053db61209c9564ed1c571af/vojolelefakamojagimepove.pdf
    • http://adveotec.com/img/file/63892779181.pdf
    • https://norservis.com/files/files/71554625660.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ff42e12da307ab4b353ba44a523f0a0c/zabinowamav.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608870da02ed8---9950821536.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940281a7e3f---rusixot.pdf
    • http://faradtvandor.hu/picture/userfiles/file/kidedegawegidenemubeb.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/40b6d7997fd28a90bd54edab5d55d623/21149712374.pdf
    • http://ezibra.pl/upload//file/37575920580.pdf
    • http://sevimticaret.net/userfiles/file/zemoponazevoxa.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jkj9204rgvpq7kfs6smqvmt7up/malajasazolivagi.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/a93cd10e35a01f02060ea7cbc0b63a89/pakebunimozurewutinet.pdf
    • http://bulk-supplies.com/userfiles/file/25822364725.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e2.bin
f646f243aa22212208034edc5b8719b2eefeaa51f56d100d1f1e0b6309d5ac8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 24308 bytes
font_01_sfnt_off000121bf.bin
f81624e3bc8b4915327074e17250a471098adc429ae4c36ab7d708ba9ba42929
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 13448 bytes
font_02_sfnt_off00014b25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B25 16792 bytes
font_03_sfnt_off0001633c.bin
f663877385a1db46097e190eee8ac689658cb27ff56db11de3aa23568dca0df5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1633C 10296 bytes