Malicious PDF — malware analysis report

Static analysis result for SHA-256 c390e41909dcb5c1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 20:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e97e613560c36340e43ec9ace4b3069e SHA-1: 5ff3b2e4bbbb6643421654ba02bf4ac9b730fccf SHA-256: c390e41909dcb5c1933345ab832e4d663a2e5295881b1782d8b06643cbae9944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=can+you+do+notary+online PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512f2e0735---861975530.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/jigijobotuweros.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/10525786036.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/66a1cbddbefb3552c9f5d61ebdb4beef/56718413205.pdfIn PDF document text
    • http://vo23.ru/upload/file/51061946095.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/88926294552.pdfIn PDF document text
    • http://belv.ru/userfiles/file/46678552802.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fkumj0a26surloe213g29g6n85/depegegugeto.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/nunolozarifiberabufu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e92308f37e7---35093435350.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/rajepekimikes.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/nemawavoreguganizad.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fm5it7j3bps0rkl85v0tjh61ks/gifebojebifibadifepusi.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezajagito.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ca9e34df595962837c859eed611e13eb/94852244361.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16105b9d969925---nakozusukawukidupob.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/47357464065.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/pebetesikesumejizuvapoz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/32021289022.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/ketesuxajadetebabesi.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/26126214521.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/paxipuxezojafu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607285afe3ebd---kediriwudifiwivasedixet.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///43596641367.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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 17756 bytes
SHA-256: a57a31cf40644a5c3056426b5d7a45a5f8c18dde6d0ea34e718eeb377a06f573
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 10320 bytes
SHA-256: 9e099804e83375a11c79d9b7adf8308ad09255d621cb9685c900de1486c3e09a

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