Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc44e4f79ec399e3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 19:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0a0d2a7bcbe43ad56e54e5ff8119b95a SHA-1: a183001aa42628a907433420a598b695224113b5 SHA-256: bc44e4f79ec399e3ec3307d5b687caa9e7ba0ea3b35ba8031d3eecff892c1898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://ketchas.ru/uplcv?utm_term=bikini+avengers+movie+watch+online PDF link annotation
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/28272479131.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210921154902.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/16682035073.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/40186052298.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///nurixikerunolivujewaboxu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/51117518504.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/nk7t1c0duqjdumfdkpeplukhtu/60458617392.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/40232058522.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xokawiwetuka.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lidibidukekevivofu.pdfIn PDF document text
    • https://basisnomor.com/contents/files/jeripewurobajiwez.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/47173056563.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/38019905611.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/81981667783.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b620be752---mipeza.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/73653792461.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/12701563871.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jerabodevarokifuzu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4ff98afce---sukebobo.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/laburibujoxodisadawaze.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/zomozirewapumaj.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/93043317506.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/magazogudotalixezeworope.pdfIn PDF document text
    • http://esejsc.com/upload/files/dawuzinapizes.pdfIn PDF document text
    • 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_off0000af08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 10972 bytes
SHA-256: fa71bf9bbd41af9e0f5d798c99cdf22f18aeda71500bffc1edfbfc83cfc92afa
font_02_sfnt_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 14964 bytes
SHA-256: 32b64e83b847c8f2be0ba76cc4609dcabd42ab77be547699ab75fc874dc6e62d