Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e91bcf865119b9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 01:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb04fee2d8b1cc8a7ce374be0009f8fc SHA-1: 337bbeb521cab9668f6fbd5c71ce7c32933b1c67 SHA-256: 28e91bcf865119b977de50097e4c3b4a396f403f7cc48f68af7628782bfe4f3b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress upload directories, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and numerous URLs point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=table+of+51+to+100 PDF link annotation
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870fcc76664---romagumupurabepiranixetul.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17b81d054---jakatirepozefenifiwi.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/naxozulad.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071df2dbf7fc---nubog.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/rokiwini.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871cba3982---791305081.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/32098153299.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca94f2306---sumawapaduniver.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/73593728827.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/nijovavufogoxotigapewipev.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/40304764203.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/23739417461.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553e47bd97---89651104173.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/nidagabivizu.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/jusad.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gerekaze.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/gajuletutilobe.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7377fca0---dadizugubepun.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8af2d1c0621af517cd5e13c59945d71f/nemanewaruvudami.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094374bddeba---famunonogekasozuxoxagibov.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/18307357171.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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 17112 bytes
SHA-256: 92b54fd81576fd77a0251bf109ae520cbfbea257119b3300bcd616b28b271cbb
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 10152 bytes
SHA-256: 21f61da3b128806365f81f65b8ab1789850db4fb98bbc2c6ff7f2512c5fc39b2

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