Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67366bd87e5bf0c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 01:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e38f9f99ca87417d0365f80229376a91 SHA-1: e0f644a6380c88486257ba4a95f2cedb06a46043 SHA-256: a67366bd87e5bf0c511a1f6149b08768ce162468817aef1bd4b829000576871e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410e9d8d33b---tonitagifofiwisil.pdf In PDF document text
    • https://85097781.com/upload/files/56731296710.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/kozikutegumi.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/30049577293.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vorefiga.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/falobenisosolowofam.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/70615297300.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vamikabasubugurotesop.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce01f33251---xinipuwosadore.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf95a7ed6---73354929376.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/3964854831.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/63888833708.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/0dd4d4.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141165316485---16736835625.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60768675042.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/79266078046.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134f46e8e3ed---kilifaxopuvibirexig.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/37255337940.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/13709783173.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/bowawurotadigu.pdfIn PDF document text
    • https://limsurempat.com/contents/files/14950035985.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/41523073687.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/120448293601.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab6b19189---93540715452.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4bed8d855df4176adf335a9d2ffbc39/wejuxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=animlovers+download+laptopPDF link annotation
    • 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_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 10684 bytes
SHA-256: 289c89846bb113c9989ec06d906744c0ae96f2cacf0fe41f8616f5df6c18ee05
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 17648 bytes
SHA-256: 601b1413a8c9c69b1d634c1f2dcb6851d56b485b82c4b3aa1762bfb2cba2f859

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