Malicious PDF — malware analysis report

Static analysis result for SHA-256 e860cec5affcd033…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 18:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac9f372193377661063b98a502dbd109 SHA-1: ffd5ab89a2c7419f3e54b797f6946aa3f03129ad SHA-256: e860cec5affcd0335c435547c9ff46dfe9ca38449682486b39dacd7af90a6e9d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=lg+stylo+5+headphone+icon PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7c8f9557614e4e2488460c500fc15a41/37342305061.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/94206238256.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161433fee77535---sidadigugo.pdfIn PDF document text
    • https://harmony.im/userfiles/file/92051255851.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/35451828228.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/75269928930.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/71996623798.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/zagafomumejorejuvotox.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xusegejukivefoda.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2c132d5198a3facf7e228ab96b3073fc/pesejutali.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/4822155871.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/58428010036.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/77662545437.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/58760835735.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614067bf2cad9---50810493354.pdfIn PDF document text
    • http://apple888.vn/luutru/files/82947190082.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/kisemafu.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/95160186528.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/15670707649.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/rogeretate.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/55282559316.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/bidobiwoxok.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/99168701102.pdfIn PDF document text
    • http://shopabrang.com/images/files/3187749319.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/vukimadupusamigisemuzemol.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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 17368 bytes
SHA-256: 6e712e2a9e090102224fd4ca06bd2d5469ccf3831227572a759478eb47d62270
font_01_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 10900 bytes
SHA-256: 1e5f1d0d30f917d1962ff670b1463732b49cda2a65c9e2447f4667e8f839fe0b