Malicious PDF — malware analysis report

Static analysis result for SHA-256 3513dfb74c2eca03…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 22:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ac576c008359e4e19d43c5b3e77c151 SHA-1: c8a184d10e2d14e978f152af33abbe5a0e6d2f53 SHA-256: 3513dfb74c2eca039941e90338c2ee4f9b5d3bd8367e1ff7402ba646dd74319d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous links to potentially malicious content suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.advokat.com/app/webroot/img/fck/file/medexofimetepatuwonar.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92990326320.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075791d056---61734072068.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/tefilatewujokumudosi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ae3019e928ec8663c5fd5ab79d37c0a/mibarenelapetul.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pdpfg8cot58geu76c22il118om/kalagola.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ecce6d403---53736509256.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42a0a1e9---75822774008.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05b524431---xeloxabujeloxibenejeve.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/xulajezulutiduxok.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/dijixikexunadelotu.pdfIn PDF document text
    • https://andrejc.si/files/file/42386638821.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/loperoritesenavesi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/fezejuminiker.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/23697992611.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/xazepofepaduna.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be86c418b70---51494898279.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/11016208794.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/9248461447.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/33119892423.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb3dbd7d7---32517264988.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b319bddd000---66725969599.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/3994255757.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/68a9897c79fe1522ee6db083c2820666/jupowiraxikujijemaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=learning+manual+photographyPDF 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_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10700 bytes
SHA-256: a96f865e913c0a50feb8340e944971cb810c6030bff71d96dcd6fcda71c57d2e
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 16680 bytes
SHA-256: d396066922c728e39384f957c3212d15c0cee39246c400b1937e8f612d244fd9
font_02_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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