Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a35043c7183101…

MALICIOUS

PDF

90.1 KB Created: 2021-09-16 17:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4639cc9d37c636260a7d4011a844ec1 SHA-1: 5570ec1f1a75ccaba8674c1c01691be88384699a SHA-256: 71a35043c718310116de83939cacbb5b0293df1e69ed824d3c05ebe244a296b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://sva-jeanroze.com/xmedia/file/zavobadabujot.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a123019b7b5302030350c3ad91c78a80/57824149351.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/94183678645.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/99091786415.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/22635183344.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/10737061408.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371dfce35d6---58339460803.pdfIn PDF document text
    • https://atavio.ru/files/file/46691206286.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/17249753169.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0a10d9e1b95d73e5a97f7d3d5bea970d/74725832940.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/48264910409.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/82673105029.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/numaravolowabo.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/girimadevabasige.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/tidenuxame.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/58807045160.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/42456448205.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d8cf0ebc---xivotesulinufuxer.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/27777948585.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/75494056017.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/zumovebenufav.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/risajeweletemit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tom+and+jerry+movie+2022PDF 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_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 19108 bytes
SHA-256: 54caa9bb63885ed77f05b992f904f4cef047ef007f13548b22217afb95e68359
font_01_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 10612 bytes
SHA-256: ef9f06678d9fb573b3802f9bb7de3da93b82abc33c3abaf1a3796e08a65d3da9