Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16ea8d8fcdfb17c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 22:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4c70b878ba4bfa93b383bed86962277f SHA-1: 1fe8c8d77d7828d63799d435a615b40707b3ff5a SHA-256: b16ea8d8fcdfb17cd1b09a0248a0bcaae066887b2305217505307bf539076b05
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The document body is unreadable, but the heuristics and URLs suggest an attempt to lure users to external sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://detskaoptika.cz/ckfinder/userfiles/files/80813752097.pdf In PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/kurasumefepefajo.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/69753682752.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f8bd672ac11972b8517fdd61768dac2a/93215122682.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/wogimojifebinenafurimoxaj.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c3cbfce90c3413a3355a3bdff15bcdab/1797083063.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300837e7a35---43331578092.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/42556281315.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/32361014326.pdfIn PDF document text
    • https://scalping.ir/data/files/file/54690691049.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/zejegopitobunotiwajulilej.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/19078640632.pdfIn PDF document text
    • http://geoman.cz/data/file/39026572852.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/bugazewa.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/51050614728.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/02220c10b513a21a8a91b03d007126a5/85797593971.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/pakuj.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/10832712389.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/15309853644.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/tixizitope.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109042102535878.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/gumanuduv.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210901_255FA096858670A3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fnf+mobile+apk+modsPDF 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_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 20764 bytes
SHA-256: 50a7c4f121a8bf3e134b90e369a15a5e83b060099363b199472f1f9e9a39673b
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 10672 bytes
SHA-256: 7aef6fbf06bb1599a5de45fc39bc88ed9fc9f6a196dde1262aff658a9c0b6877
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1