Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a22fd491cff9ac…

MALICIOUS

PDF

86.8 KB Created: 2021-07-27 22:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4922a17211b09d5a1274e32f392f2dd SHA-1: e6df7036fe94a90072a5806394607721966b2ec8 SHA-256: 23a22fd491cff9ac1206f555bc7562ced4b5e2088ec260c7683ec6993889ea71
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. The presence of external URIs and IP address literals further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f163f9a5bc---89244746796.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd21503ef1---85333228172.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3kal90fh973vv8bkoskg3ltj00/xusetixodosagusime.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37294241d7---46487094929.pdf
    • http://happyhanool.com/ckupload/files/fobizofedokimedoximimif.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e149e49bf---gulup.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb87f83c1a5---20645221855.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/43774f217988c531b23c1f470d1b8ff2/3878371433.pdf
    • https://bamor.org/userfiles/file/nedawamariromatibobawela.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/17e1ed17501a978951d82475d3964ef8/92494601821.pdf
    • https://tecnibat.net/uploads/archivos/mezimareb.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99c64da57---16026582253.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e8b14f592835803474529669feb32e33/bizusakowunawolazokowasu.pdf
    • http://aarogyamedico.com/userfiles/file/japikefedobuzopelifapo.pdf
    • http://ltmetal.com/userfiles/files/vobigusiwaxigokuledef.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/4g9c2gvccnfg4o5lk80jlglnb7/18607373261.pdf
    • http://nissanotogovap.net/uploads/images/files/wejamutavewegi.pdf
    • http://www.zywawiara.pl/pliki/sajetedebofewaxuvif.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fab69da15f923bd7487fdcc8aae5a6b7/6927488627.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ba62c81cc89d7df7eb412a3cc5848358/17254678375.pdf
    • http://thuexe7cho.vn/upload/files/miditefifodo.pdf
    • https://contabil-fiscal.ro/mm/file/46015741083.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd1e2d2ac---20934980108.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9848c3487---15463356310.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1949df7de84db8059fd6c955ea5dc278/xavogakefuxenepipap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+remove+a+timex+watch+band
    • 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_off0000f0e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
font_01_sfnt_off000108ff.bin
98f874596f853eabad7502c77b1c7af8a61ebc7aae4607a1c1a90a53a7f3396d
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 11020 bytes
font_02_sfnt_off00012272.bin
56d6e1438ab7b0c0cc2154e29c27eebb8e2dc86eb48adf6536b359738577de7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16584 bytes