Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f16f7e43becc79…

MALICIOUS

PDF

67.8 KB Created: 2021-09-08 23:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c153d8f0b5c6243095182926940b96c2 SHA-1: 2d4abc617119d923452402e0a313448ce23d456a SHA-256: 12f16f7e43becc79b9bb62f2dc8ed67f96850b674e56cdaff1e420ca54044a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of a Google feedproxy URL with a 'gta 5 free download' term suggests a lure for potentially pirated software or a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/9679419609.pdf In PDF document text
    • http://puebloexec.com/userfiles/file/midezebanebabumibe.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_052331.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/59357523690.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/melilala.pdfIn PDF document text
    • http://mlight.cz/archiv/file/tapunovamopagirun.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vp51sqssibdn0ouk9tr5ofbihl/wibejopawidaratetibazixu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/puromojamidudobige.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/59598942024.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613535aee18a9---49616343515.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/15035202268.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_9590AD53E8BF33C5.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/famakojomanudanowotare.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/gasawimepuro.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/229474299.pdfIn PDF document text
    • http://maxbrio.kr/files/files/23849122296.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1e2f2476942341fd8251822f6f00b502/nilumivikovibosubuva.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908153312.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/68028585736.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/96982570691.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/3522866611.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/52420874318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+free+download+for+android+phonePDF 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_off0000ad82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD82 14232 bytes
SHA-256: 9d980218aa58c157fb7a038a8390cbf6c4e423c8a5b36c5aa5a186be1a23a60e
font_01_sfnt_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 10684 bytes
SHA-256: 4acd8686dfc2cb0cdae9a25c4aedbd3a3e8ec9dd9b712b0507c19cd710677b84
font_02_sfnt_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1