Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef4b8ad637e62f3…

MALICIOUS

PDF

87.9 KB Created: 2021-07-22 05:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d75732fc3eeb8d9c683fb030154866b9 SHA-1: fd219698d0153798fee187a06910b4718640732a SHA-256: 2ef4b8ad637e62f377518674f087a5b4719038e2700b904c16688a881351c827
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics and URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://accesoriosalmayor.com/images/userfiles/file/32699638814.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3db6129ab---71863644407.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/61896226424.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdc634f89---gijad.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9865de08e452cda369e6fe8a4f56f425/25356593176.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/en5tmpkhg3mhpamc08bcne6bs5/10255901853.pdf
    • http://artstudiodesign.it/userfiles/files/nilapapita.pdf
    • http://rocb-ap.org/file_media/file_image/file/34475689863.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9349b5c99e27ca30192199be85e2b27d/buxepuvibumedow.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/uf9q1j5282p42tb3lu6gm11f8q/taboz.pdf
    • http://ankurgroups.com/userfiles/file/fovawep.pdf
    • http://korean-school.hu/hangul/userfiles/file/52521896228.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7027d5f1ce2261b3f888eb0a7d8617e1/67408461818.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/87662032071.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/lupesufalewos.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f32e6267---pifex.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/89eec786f14687bde61d516789c9b5e3/fizusedovolanomuxajafapes.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6345a044b---16330593205.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0c2742a9---xejukewokolitisoxolema.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d359146a---xadikekuzobosepuwaguduru.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ac7ed438---88599735975.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/786706efbf7c34ba16e2434e2d09840a/kipiz.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed48e9309e0---tizosipidoterularuzi.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2e5qpobjg9ue05nrs97s5mhr75/gigowibaganazofubag.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16075eabaa4f19---55269318487.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07906a11c4---31868554626.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/eb899894d8a6e4abd0200c291841e50f/badozalarasunurudik.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ts6k9fdt080j93eqfegb905s7/gixapin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=west+end+brewery
    • 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_off0000f53e.bin
6af30db8195d42bf1636b60e12d71c2fe83f122bca5bfb479c753ce770265ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 17100 bytes
font_01_sfnt_off000121fb.bin
802c2b203191c3a6b4843fe232e2f54ded8839d2d9d25662c68df71157c95a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 10156 bytes
font_02_sfnt_off000138e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes

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