Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12db4e56323cf4a…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 13:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12d42f56c89a39db9f5d8d7387b222a4 SHA-1: 5d8035e9869b6c9bcbf452910df6e8ae3f04acca SHA-256: a12db4e56323cf4a8b79f8d38e4ea81a27b00c22a1ad5348fb43b83f02ccfe33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be compromised or used for hosting disposable content, suggesting a link farm or redirection scheme. The presence of external URI heuristics and link farm indicators reinforces the interpretation of the document's purpose as a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokinerugit.pdf
    • https://palcev.ru/userfiles/file/lebatolug.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/52089401840.pdf
    • http://luxlustry.ru/img/upload/26454970713.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/gowajaxigaxirilemedineja.pdf
    • http://ubestsports.com/imager/files/20210928204445.pdf
    • http://jjmcp.jp/userfiles/Image/file/gozuwemamoxoxawimap.pdf
    • http://naso10.com/userData/board/file/48677151101.pdf
    • http://zamgph.com/uploads/file/040853452894.pdf
    • https://vanchuyensahara.com/site/files/tunokuru.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149112117c92---29502033663.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614331e9c8f85---giranilenelimavid.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/bezowetolotavunogujuwolir.pdf
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/jobevoxuburo.pdf
    • http://daonshop.com/files/fckeditor/file/41783327594.pdf
    • https://marblobath.com/app/webroot/img/files/sosewutilukalazebuxife.pdf
    • http://jeanchapleau.com/userfiles/file/mupoxasoduduruwutotovuguj.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/vakepanepapijunupol.pdf
    • http://kondicionery-elektrostal.ru/upload_picture/file/barebodowapuvonu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a10006aca---60992995378.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/30593550866.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149190534ec3---kenorigajejekunab.pdf
    • http://serdceprirody.ru/userfiles/file/65768466861.pdf
    • https://granitnet.hu/editor_up/pibaxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=balancing+chemical+equations+worksheet+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b495.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB495 16792 bytes
font_01_sfnt_off0000cca7.bin
ee8a238e4dff869fb9cc69c7183b0249eb5769cb233f3b3c0b274986d2de94eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 14552 bytes
font_02_sfnt_off0000f102.bin
a816e4f31c4b666e5677cff9f623c53d596ac7f21a9f73d1753e1cc3f5985d48
pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 11272 bytes