Malicious PDF — malware analysis report

Static analysis result for SHA-256 8351577cbf9d139e…

MALICIOUS

PDF

86.4 KB Created: 2021-08-10 13:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f97a5d37d8a5bde2790d12a4a8f94b44 SHA-1: 0f953e34fd1ad01d76bd3f31c938abd777dd5495 SHA-256: 8351577cbf9d139ef8ccae66d2967c436c4a7914eb4976883400398cded87bb8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content or phishing pages. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=swagbucks+live+app+download PDF link annotation
    • http://unitec-egypt.net/userfiles/file/zupivebufujifen.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b5b8e329---jabujuzasopatisiw.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce421eed9b---noxifubigowamubofekaz.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972231589d3---bogivit.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5cc71a0c2---wugijuzutixevumotufetig.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/77210735229.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/7300251057.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-9/20210809225111318519.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/caae12e2956f90c2b448597f813898df/pufimofu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62884059729.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e429139ccf---jonanatorodofelodup.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/xejejazepesatavi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jojovumafuxekutepivo.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/moneweperiber.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/mafofulib.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e8f2fe3868549ec80f53bc0745227f3d/60094009435.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/lakagimoge.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9129a0bc---16651216411.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/1d7c930734c00384bf1f1559ec01bcb4/mimibakafuvejedun.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbb964ddc51011d5f1ff8e361a278d25/zazuwaviwabulo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/r1g9jdclt7mrb48vbult5uc5m6/sofasaxenubul.pdfIn PDF document text
    • http://derma-dts.de/files/file/97282989736.pdfIn PDF document text
    • 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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16876 bytes
SHA-256: 53fde1444d3fc1b468a25a05648433f702e6cc4ee51109b3535f16dbf68f69f1
font_02_sfnt_off00013232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13232 11048 bytes
SHA-256: a163093ceb8af4b303b3bfd420aecb532dbdcbc9afcfa20a66d83fad6f358c51

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