Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb3dc167c43c1e7…

MALICIOUS

PDF

94.2 KB Created: 2021-08-05 11:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fcec3beeef2b7035133e7dfaa6192e16 SHA-1: 69610050edcbbdf992e6d409e0b351587688b54c SHA-256: abb3dc167c43c1e7f0cdcb0cdef4357ace0b559990a259dd70a97f7ddab92dff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://refah4ter.info/basefile/hotelrefah4terir/files/roniwusufinidamixorej.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f21c09e55657db4b8d944d44e77753a4/vavesobitusexagazitib.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/21119221535.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/nazonisenawakuzulokizejiw.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e92fbdbde---29125222375.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d3373d5b80c8e060b9059f1c387b5683/galutiwadapobefoxiwujo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b022e368a3f---dukitexumupozarexuguwifo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fulumeja.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/36130902222.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/r6vg0s3l9p0ev2034gnjjahu1d/takajivixuranulibimijaf.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1b55ec98---faligasetafedupidojetu.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/ralazopivenopurakafinute.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/zufozi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16109cd61f2db3---48209347712.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/157eb27c51a20016a8b9796e7366e267/68636697895.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271453358735.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/121282472e0663db6ba2458f84822c4b/mekujezafugogulimola.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785c51240b0---10752751174.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa641dde0---jilonis.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fd13122cef16e947693d0232b4439e6e/samefaxefezurodajudupos.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/77826540817.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02331264ce---degodosamufumowisemutek.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/31301815143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tu+tu+hai+wahi+dil+ne+jise+original+song+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 16204 bytes
SHA-256: 8f64c845bde25882752961ac5d4ff1adc737045c830c58c816835fdbe2db4b6c
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10808 bytes
SHA-256: b0473eec18a65ddeaec6e15ee3b15c6181de4dfdda09ecd44c552759d9687428
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 18136 bytes
SHA-256: 3782d675b57a2fb99efee22ecb48d45a37de151f27d3545a35ec4890f0b0d6a1
font_03_sfnt_off00015246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1