Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdcdfd1794eb78a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 00:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a8fd4bc04e1382b2a27828174401364 SHA-1: 9fd807c77704d86c436fb824d09baca08bdf0a26 SHA-256: 7fdcdfd1794eb78a55b4dc189e71bc20a72e9acb3ca0a59f3a68dbcaa391e8c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to external URLs, some of which are hosted on compromised CMS platforms. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=dream+league+soccer+2017+apk+unlimited+money PDF link annotation
    • http://rsport.eu/yonexshop/static/file/30575284195.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/dekujamujuk.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/texafinisoboludog.pdfIn PDF document text
    • https://ratodua.com/contents/files/jotiwigevuremupuvadusowud.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/mepibepuzor.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/63276293440.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/dedinilesavufofurixaxiv.pdfIn PDF document text
    • http://houselandia.ru/files/fefakuzox.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/99945014829.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/pukujudikavikizebawesutuf.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/83865925491.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/3253289308.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/36192288302.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d157e336497452408d7e74f3017408e4/rirutupasewonodubisuju.pdfIn PDF document text
    • https://brakos.it/file/gubutasufavufikog.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/70995466942.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ridow.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/valekowowilid.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogunurifipux.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/zoxiwiwudifomasaj.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/58598610429.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161344991635c9---mebodegofanoritof.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbeb70db7---47431464198.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_off0000b974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB974 11508 bytes
SHA-256: 875d6724bb67430e0b3715f274190c21b7901febd7e6d916df940ddac3cab52f
font_01_sfnt_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16684 bytes
SHA-256: 5b0cd5e84da8b127b50a5e88e232d364ba09959ae2a556aca0a6aca08f7c4b5c
font_02_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1