Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fcb42bb3ea4657…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 07:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdf1da43ca709bc9402b44fcc32b55f3 SHA-1: 8112770e6b4e10bf8278470ad54aef1de33c752a SHA-256: 24fcb42bb3ea46578847edae09778f411a0a3445bc44ea2bdb4f85ed1d3ba6dc
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. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://valsadindustries.com/userfiles/file/rubola.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/dfab3bd7e56506c8e68c09c1b30e98f9/mapewuxisuvi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f690b0d47d---74303000972.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608050d2cdfe7---37967518074.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/99412565775.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160835a4c61fe9---xifilunerulig.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160819eda50baf---42266437642.pdf
    • https://aashianarealty.com/file/vakovibipemuni.pdf
    • http://www.tekkoo.net/images/library/File/mobilusobanabudexa.pdf
    • http://mu-rrrc.com/userfiles/file/kasugukotorezuzejo.pdf
    • http://rhodeislandalpha.com/clients/56223/File/54427109848.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce700046dd---vegig.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d7a64eb0---pazeponazedupad.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bd259b63fedfc48cf0ae94aec02c927c/63040946034.pdf
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2031406687.pdf
    • https://bataretak.com/img/files/file/jubetaxupojebegese.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2ea5fca8afa2bcc0aa1641d4ceb00f8b/fifima.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbf3ca83c---95138460937.pdf
    • https://ultralloy.net/upload/files/japinefu.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/fizepewowu.pdf
    • http://thienlongadv.com/upload/files/92794612842.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=subjective+and+objective+point+of+view+worksheets
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3ecda096f67c32da3a8ec11b1d698219/junitev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d576.bin
a2f5c29eca646c6aacd5b59372eb11ac456eb00899cefe83a1846949654677e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 17640 bytes
font_01_sfnt_off0001036c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
font_02_sfnt_off00011b83.bin
7ca7051a4067bbefc9df270d162efda63e0f2729efb912fd88938b4291907a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 11360 bytes