Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c30b6a6309a9b1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 07:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf389ba484fadb7286c7e17b76324454 SHA-1: 85f9caf2c4077a16defb2a7bed94f9c11371df48 SHA-256: 71c30b6a6309a9b1975f1b6816412c9248558ea957e9454ff11e73c99cecaa53
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with clickable links, designed to trick users into visiting external URLs hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the execution of malicious actions via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1807f778659683dc5c607998ceed9b74/zarepidemuvakuxabubi.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/255d8aac2d9a74d274a5c7fcbdf15a47/60860204922.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/55839690105.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/13368035036.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4qmftn1r4kgclsdb8um4m4ql8p/favabovetexiwa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8e32e4f8ced1b6b251126c789e8292a3/82404792783.pdfIn PDF document text
    • http://iccarrentals.com/files/file/25939018447.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b0b8bab403ac4193365f875dbc7210b1/54133954486.pdfIn PDF document text
    • https://tcremich.lu/files/files/tokonaxevovedukime.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b971c7e0fb1---peperejamufowomavuwaxer.pdfIn PDF document text
    • http://parfumland.sk/upl/72457018787.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/latulewa.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8360955e1f---15857065339.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/a7dee30q1q7ev8ueg9trstfv96/wofubobinutavobabe.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/92593325264.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/34570160754.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/tebexozatox.pdfIn PDF document text
    • https://loctra.net/userfiles/file/ludiwusagixixexita.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/berakigufibaman.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774997e6b2d---radofugagevojelapiboxalol.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/13350439033.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6d4fcabe71d62197d6eb856d2a9064ee/47073157780.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3916bcfee5a2a8d00d455fb6a401790f/34230879339.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bd096839eaa4b1644e00d77b1efd0c04/zaxus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=continuous+charge+distributionPDF 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_off0000b9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 14476 bytes
SHA-256: d4df13d4cdf571cd870debd6125264ba68be3e8d9fbf13ea5e641d63602200ec
font_02_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 10872 bytes
SHA-256: cae75f8a3cbcff7393cc1e7820caa4d583089cc88dbe0898112f3ec18bf92624