Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82cea5a089ff055…

MALICIOUS

PDF

101.7 KB Created: 2021-07-14 05:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e3b50e7c733ed5e5011ec93c548ea44 SHA-1: ddddeaf574149d0d4300f1e66aa8b60b2f00e695 SHA-256: b82cea5a089ff055ea68a903658b0ea672c978af0e65e4db7981f47e58036d2a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly indicates an attempt to lure users into clicking them, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://antwerp-reefer-tournament.be/argt/files/dexelebi.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/g2pb2hmpmct694q8gr0phk4gb4/tuwuzu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/664ff80c756722997cf0f51259d94b0e/57789414168.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6620a1978fae1308bdbff446d7409f18/xasijoximirefanakatawa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/94280037066.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/xiwajiduduw.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lq4khl35n9upvhrr84nv3nnvuj/bodivuvo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/423b1339324d628a453096e7a2f870f0/25704713302.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/86840704196.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-7/20210607104739120497.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/70423621146.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/aht60beu5n14uqc7lubsr8bo16/tebowuvedina.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29459055565.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c8e8ac79---tirilowabijofolalatuzati.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/65880003880.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/julabotinekenorajusu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/66812879702.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5acec298ff84e9dce2f1c14620bb5af3/83701681686.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ae2ac089---gefupidumizigegasad.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/237e14d98becab2e2280b0e29a7ea5d0/kaboxizasajuvupurarut.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8864fe864f---12757496294.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wetekijufanekiseba.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4e33d6466---27894394332.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tut2sjdf1tvica4ilpd6kfsjvb/28464407388.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b08331e3---10307734273.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/48595177633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=can+i+get+remarried+after+divorcePDF 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_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 17144 bytes
SHA-256: 1ec3aea0730cd55e9fa5591d0989208d4970b931880ffd041e80e9dd6c72a6cb
font_01_sfnt_off000158e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170FF 10704 bytes
SHA-256: 200f7d86f1a875c142f44d0e6c43cd6da3f38865c633ff78ff3674a30ab9139e

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