Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6adce46bb19ee2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 04:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c84b8eeb653e31da7a33ba0013ae0d02 SHA-1: 43b8971dfe057da57bfdf6c6e0925e5d82b3eded SHA-256: 0a6adce46bb19ee260345a5eba92e9e62f725177d97c56808f98e3606d6e7150
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lead the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=download+cross+dj+app+for+android PDF link annotation
    • http://mfcpavpos.ru/file/kutun.pdfIn PDF document text
    • https://beaszemin.com/files/72543607893.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/71264699991.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/57022510849.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135297680c86---tusixegiwuxuluxuduxivol.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gepowuva.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210912190157.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/temitepaposizogajudawavox.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a06ea6792e40520c3adeb0985759fd9e/xoxotiwonekufaxaje.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/71681565921.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/wobarotutawutowaro.pdfIn PDF document text
    • http://spiregene.com/image/files/20210912_025006.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142577570031---koronogegonovanemiwiz.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/momorikagoneme.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/55486102356.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135322f83c60---60575693083.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/legiminowawizozanas.pdfIn PDF document text
    • https://qnzar.com/files/4541089586.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/rewapanot.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/53815413112.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fc7472161ffac43c65a188714f0e5b17/70934348449.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/4476733507.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/delotow.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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 10600 bytes
SHA-256: 28cf84f268cb37973a3958879b9fc54f1482cb805d045b78314cb9e055049495
font_02_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 16472 bytes
SHA-256: cdf3d6d4ac7db96c9674a4d168ab9004d5cf530d920a048b86705186c549c368

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