Malicious PDF — malware analysis report

Static analysis result for SHA-256 a080042cc59bfad2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 09:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d727c0cf712f087facdb71706f3dd34d SHA-1: f8d35cbdd243c92ff1399ea6c03ba609f1053308 SHA-256: a080042cc59bfad24386d1ed26dafa26b97b0ea78df16389134d471174674c13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a208c288873---kijovejona.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/399e3eca0397fb01e02e6cbb3bdb1d6c/68036601213.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76d32333e---42079185749.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/71754203439.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ddc8b406e0c474dc611809508c058817/896679333.pdfIn PDF document text
    • https://2winit.com/Files/files/mezag.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/fezejavuko.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xufusibawetogarixule.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/89929141775.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18418c0c8---5798233825.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/95225883609.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/4920256173.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f78efc4---divewutawupesuzunovoxo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c25fbe893150a6ba4e68515e49ed643d/tilowerowa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5f6a83c71---ronoxoruburogikarolona.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838c22edde---562701737.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077100242f2c---49161197799.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce23cdc610---totimakoduvizizutunokavug.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/3634664200.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/54550321552.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/48957561150.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/77454942283.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/furilebafanugozire.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/423056187b7637ee3927ddf227602aa0/zokajaxediwu.pdfIn PDF document text
    • http://rsentco.com/upload/file/bomelufoxepadajoguja.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/pejivipibusigawusibififeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=importance+of+record+keeping+in+business+pdfPDF 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_off0000bc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0B 15140 bytes
SHA-256: eccefe136ef3d8a5c757210fc5c370145b55bd3df2b0a725e9f5a5c34ce9c95c
font_01_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 11200 bytes
SHA-256: 0d02dd3ec1c8b1d348b91539834235cbd24c08ac780cf3d2e7344f7d3aff07ef
font_02_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1