Malicious PDF — malware analysis report

Static analysis result for SHA-256 f625f671e00e3bc2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 11:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45d3b301c1e7e834ab0fc2f1fb4af531 SHA-1: e407b346925223d26ce86566d867a3541bc13801 SHA-256: f625f671e00e3bc2233a0e2849c28d0065baaa7432d9d4c01e3a6d546cebabce
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various compromised websites and potentially disposable hosting. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=best+apk+mod', suggest a lure for potentially malicious content like 'best apk mod'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=best+apk+mod PDF link annotation
    • http://benthanhsgfarm.com/images/uploads/files/pemozupiwiwugu.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/1765735389.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/besej.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/gepedexunilumudim.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/vefodibowigotav.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/jusanapopupuvuvakixaza.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210919144859_dzdw8r.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/771e8f89a8887ed2be83ef0b588012c8/tujusagojo.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/29396168719.pdfIn PDF document text
    • https://il-gusto.com/images/file/lagivudemis.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff804ab466---66942508567.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b9c6bd461507db866275b1d29adcfddc/fajidovanabatut.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/xufamenakirifazemewak.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/9851741205.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kuwagagoxo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449be8f52---86790083320.pdfPDF link annotation
    • http://thewellmanteam.com/userfiles/files/salemuru.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7a734cf67765a1ae1ffb50243747c941/3386847049.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/47717551228.pdfIn PDF document text
    • http://citty.org/images/uploads/file/jalekatowopafotorewi.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/negofetegilupajug.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/gimilupozek.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109071228282200.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/40769890569.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/welojoramiripovebeki.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/99739927003.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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 18092 bytes
SHA-256: a9457ec04c0011cc58a328ed1d7d83f9af15f4c1799b624f4e75a0137f295414
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10356 bytes
SHA-256: fdad0a9c189c39bbd33b4f1f6dff4079953e28c6989170eb9023219de6986243
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1