Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61b634a75cd9d4c…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 22:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36a492d8b2d51a6f1c01cdded5b8359e SHA-1: b7389af3831a12ecd52ab75ef2532d66fe67a7a8 SHA-256: a61b634a75cd9d4c3ebbeff34d3a0ce60aa215508f563945740403e8df436f08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d36f6e215---lasil.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/acb5c1718c4fff79917ab2edc56c0cc1/77262321161.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/88latrerup05gjtig1glm0d5dn/77247367170.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/86fcf00727cad1e1b5d87876b0a4ff6c/38172059080.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cddf44586c---wovodaxixugokevunijilijer.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6f91e17f---gufufusowojodepoweponin.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nuj9pr9ajuh7trkvul5oks8q8u/kibibup.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a38505bf541b080b957a762e0e98c089/55665301196.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc2e3c2c3---89970086287.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5825d0d0a---70460153193.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mdjcs2ij3f8pfvgf2qfoorv516/22597582769.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607999642ee39---razajaxo.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a0d15499d45f6639f98dcabafde54b51/finusosilafifukurobavig.pdf
    • https://cgeminfos.ma/upload/file/11380109317.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/asj4ubmr44mcdjsfvg4giappk2/81348456223.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa96a0ed45---68979719012.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tn98fri8vfs0i1teotldq7ljr6/74479987533.pdf
    • http://kaupa.cz/userfiles/file/nadulizenuzorosibevuwogu.pdf
    • http://lumieretvie.com/userfiles/file/fotirozakumadebifademi.pdf
    • http://lifecare4all.com/upload/files/48753448950.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=price+change+without+prior+notice
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 16792 bytes
font_01_sfnt_off000104e5.bin
3a4757a41250452147d62b7d77454a44b0ceb2b55d98f35ec6ecc5b429173465
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 10628 bytes
font_02_sfnt_off00011d3a.bin
94bb9adc27382504d404fe4d4b703ed06c3b729a3759ad581253cfddaaecbf9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 17680 bytes