Malicious PDF — malware analysis report

Static analysis result for SHA-256 94871d323cacc485…

MALICIOUS

PDF

75.6 KB Created: 2021-10-07 01:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd6292fadaa688166bcb8bfd734c71ce SHA-1: 3570f7abb1552e2c83e8ef3b0fc22ec0a1690202 SHA-256: 94871d323cacc48592b723be42dca916084d40dde7d66deccaa64223c79476b2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination. The primary purpose seems to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://allytemp.ru/uplcv?utm_term=principles+of+physics+s+chand+pdf PDF link annotation
    • http://greenbelt.abwingsmd.com/uploads/files/40133822450.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mepip.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///88630899379.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/vetexuwawusaxumageno.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/kinob.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/24663325255.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140acd0300c6---mujudu.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/sexepizuzixuse.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/14287558479.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/nixerupezixetunajom.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/pemuvetepojakenadimepidu.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/lebigesuximazunodu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/tokadopofotoni.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6e3c6ad80---69068357900.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/sidawokiweruzunupapi.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/29747766119.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/keviradufol.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/lejuwaxajuravoveluxa.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/pesolukeseg.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/gexamakoxuxodegoxefe.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/73957584300.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/a66fdpdessmgo70hbcoitgnd22/sifoloreluxag.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141efa9204f3---97491919910.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff05a96a30---larivinajofuge.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/65908804099.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/taregofa.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/xaxiluwopixaxuzujefokabup.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_off0000c0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 10732 bytes
SHA-256: 8f410ccf85b840a87af4c53c9072b1fb9bdadbd21291476f3c6ceb04bfda6871
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 17552 bytes
SHA-256: 7b95fac27803de9fa69dc13e0104d004e3e9104ce7c6702c1a2bb0ec99cc4b82