Malicious PDF — malware analysis report

Static analysis result for SHA-256 b972ea63aa1b7854…

MALICIOUS

PDF

87.6 KB Created: 2021-08-04 01:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62d838be71867fadae639afc6d55a3f9 SHA-1: 3a5fc873b40743b6aa1256d9465d860988e6e85c SHA-256: b972ea63aa1b7854dcc4025ae89e1d411edb0886546a97a0e709bc4d8bb663ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to lure users into downloading further malicious content or visiting phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://philabc.ru/uplcv?utm_term=how+to+download+amazon+flex+app+for+android PDF link annotation
    • http://residencecarlofelice.com/userfiles/files/29418982129.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160e5716dd4963---lafawujupupowobopipefan.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/16kgergdggk7nvb0ane3k1ieuj/wafujevexizupekir.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/35250024476.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b169a76b7da---nepofujit.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/darafolinenazojoz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f33def45b---dibugagolara.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/73820642195.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/purinupa.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/jopunezinofilewul.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0o6jnvof41r11824p972mm7nj3/bowuxesef.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d630288aebdda8374e05830bbd79665b/jokofudubudedobom.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/wajexud.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/91060969228.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1d79a68bc8326d0a99493f22ff496d7b/12154777771.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/bajijofakalazajepodelowu.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/24565353609.pdfIn PDF document text
    • http://alkanboya.com/files/file///65937188978.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/xamuxejosow.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/43938542343.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/60548674986.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/pakarurikesilasep.pdfIn PDF document text
    • http://gyobel.itpublic/file/zovov.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161071733e03a8---32331265707.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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 16908 bytes
SHA-256: 51e7d480eb2d183d77d0386ab9a36e8dbbff8957d5b110bc6a2a3530bca24afe
font_02_sfnt_off000136c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 10732 bytes
SHA-256: ae3eba97e49c95809e406761d89120410aab673c5bcd0412b51c5fb8d9a479e6

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