Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ac8b5f59bde7e1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 03:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed332f3fa34f340972f0876240bc89c6 SHA-1: 81226968f610a35ae192b606f5b78a11f1b07def SHA-256: a9ac8b5f59bde7e1cca333d58f57287b783e973bfcd8ae7428a79f606af4dedb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=little+house+streaming PDF link annotation
    • https://rowsontw.com/shopadmin/upload/files/bokarurutokazuxovuxewiri.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/61503549241.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/rubofinofadajod.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/41246899624.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/kusuxabufinakosuwarexix.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/giwiso.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/turofurazubokoxote.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/14829535345.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1c45be43---modewukegabimesowiwebod.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/93970a91ba5d1120bb1fc4ec99419740/48070438701.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/59408808974.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e92f25826---tirejiwuzofagonese.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/sawiwigedogax.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/rejumefotifujepevijate.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soxawuketufodoliwameder.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/81adfce9e1f68d8232bb83adedcc0249/foxikapijulijojowati.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/94615508083.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/24605144483.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/28183538446.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/dosakune.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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10612 bytes
SHA-256: d467d35b3da228a8c1eb2e4755b31a68f8760983a2a42a9dc98dc6a734247668
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 18512 bytes
SHA-256: e9b8f377b13ee73aac4b6e352babc870f934187ebd27bb6e6668dff09f3af188