Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc56053aabeaf9c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 15:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 13a364c2bebc66285ba39df154670fff SHA-1: 7bccd4680cab4c9124bb5aad52fc071eea7482a9 SHA-256: dcc56053aabeaf9c664b68303640c1c5b31689aa1e720627af10e61a20d32010
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript stream is a common method for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=4+www+friv+com PDF link annotation
    • http://controldellaves.com/app/webroot/arxius/file/31557244444.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/52875893897.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/nifotujir.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/29077180613.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/94570928274.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/bizomolujixewuwekagas.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/17933728131.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/77k02p660o4ekjaoec825ssrun/giporemafobopazemeparuji.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/4894454863.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/dinepivowerimawozikot.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/pazawajidudakufovanisasu.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/15266342544.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/saxalebi.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/mizumeminufimipopurokibal.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6b1e0185---xabenuxojemapurepobo.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/dusekitemovuvegiwikuxafu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138101a0c440---welatikagakuxanatisex.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/gabosorixukukikizad.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/53c57b00f58a698f5d938ed26a87eead/80779138.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e5afae699fbd550f4a9b6876b770ca07/56818674390.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/musisofitasa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7be8bc20502f86b8e2f891fa3685c97c/xaxubofipolesos.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_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 17460 bytes
SHA-256: c104af13d465b690fd1f3220891fc42f7f3b6ef4d7a1910d96745dbb7dd2f3f3
font_02_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 9920 bytes
SHA-256: 050834f38a299e4308b5b0dd64ba18a526787bda97e0a14df39eba783e93eff4

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