Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ab3021b57d739f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 01:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0c9cb73438da08b878b87252954cd8b SHA-1: 9b75df3fb1cb27b29152d7274294061fb4cd9dd1 SHA-256: f7ab3021b57d739ffbf49635923251e19086c5cf5c308a7778de93064b4adc13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs hosted on compromised WordPress sites and disposable domains, likely to facilitate the download of further malware. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=frp+bypass+apk+tool
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe8de28f1---filotikobonebogubenobuzu.pdf
    • https://suativisamsungtaihanoi.net/upload/files/7454898980.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/njmmbked4om2gbj06tc40viqo0/wapagezimiminewotus.pdf
    • http://gildiamasterov.ru/userfiles/file/21578188010.pdf
    • https://szekszardportal.hu/userfiles/file/jisufed.pdf
    • http://ghalemdi.com/userfiles/file/nutitifoxibipezik.pdf
    • http://rayanchem.com/d/files/gamaluwifavawidik.pdf
    • http://josquin-capella.de/download/bubofosexodoze.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/19411c9624855c6abd598846823accd5/22455956062.pdf
    • https://telliogluhukuk.com/userfiles/file/koved.pdf
    • https://mrdak.cc/uploadfile/files/wuvaxapumumiwo.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/40927008913.pdf
    • http://brbud.pl/userfiles/file/11295107891.pdf
    • http://belly.bpv.su/content/files/files/45447916235.pdf
    • http://vaonhaphatphap.com/images/uploads/files/samepek.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c43c583801---21680723981.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/dawazerigudepakunip.pdf
    • http://group-anons.ru/userfiles/files/sexijunojezisanag.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/lakeguzasapipubasoxubana.pdf
    • http://dragoniresorts.com/userfiles/87019876451.pdf
    • http://constantcontinuity.com/membership/data/files/xegisepadik.pdf
    • http://houselandia.ru/files/xesatijebibid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e136.bin
02c1ee409e5d3813f0dcf5187de4d635b99e78b7d830112d3669ee63cacaeb9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 17872 bytes
font_01_sfnt_off00010f5b.bin
b4462306b3e74776f6c5be6486e718d4986cfba3252ac18656fe0ab48b475f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 10240 bytes
font_02_sfnt_off0001264b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 16792 bytes