Malicious PDF — malware analysis report

Static analysis result for SHA-256 f399516a956ea89c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 02:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab238777a09b32b8e0e238d180a88188 SHA-1: 6a504382168c1e75b18e91ec5e9fb4a0a2910522 SHA-256: f399516a956ea89ca4c81bab32687fab87daa69521cc2d11ce93ec9c034317e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one that appears to be a compromised WordPress upload directory. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://smidgel.ru/uplcv?utm_term=pixel+car+racer+supercar+mod+apk+download+android PDF link annotation
    • https://www.bnbtravels.com/ckfinder/userfiles/files/63082214751.pdfIn PDF document text
    • http://venkateshservices.com/uploads/domowijefagegimitudoporu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9b127e6242b175d9cf3255af8587d99c/58197300781.pdfIn PDF document text
    • http://plncse.hu/php_data/file/95641078762.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/55339954074.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/zujolajufeleli.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/nejanuxonutalifo.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/74164048907.pdfIn PDF document text
    • http://novichiha.ru/pic/file/xukusaxepazubewizovoj.pdfIn PDF document text
    • http://teknis.it/userfiles/files/rumivuxalewewurox.pdfIn PDF document text
    • http://jsdarvin.com/files/7619470760.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3p07vh8njd6qp7b61iqv3i5ou3/13979779227.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/xobilawunakudu.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/xezedoposavulufiwoniv.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/befegixofupuwegipulupolof.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/18850147206.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2443769b0---dirukovedivif.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/zoboxigigobagoti.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/25677088055.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/vupuwupazagubu.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/xuxedizinire.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/41479371620.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/20876751289.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/gokipixe.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_off0000af60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF60 15640 bytes
SHA-256: 46e4f0cf1615479204aac7755f23ace980ad61221c4ec616a692afd8605c4f57
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10956 bytes
SHA-256: 5ce58109ec181975437e0de4f69dec3282ac56809590a550c8a68305d8cd0d2e

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