Malicious PDF — malware analysis report

Static analysis result for SHA-256 7353bf3a531f35d7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 02:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3938d457ac43c7f3d832afab746ad3b7 SHA-1: dcac911cc2328240483a0ec3c69f1da9a1cc4e5a SHA-256: 7353bf3a531f35d712451f4fd583df4f28ecfe7c8e43c1e394b181a68dde48c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=android+tv+mouse+pointer PDF link annotation
    • https://merohamro.com/ckfinder/userfiles/files/43734384978.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/3241411556.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1af1b1301---makipelaxefowulu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/ritidatozivanadugadakujam.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/2011873949.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/80440936040.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wametelajek.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rivujoleniraxopakesoxalu.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/bavot.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/vawujifabelapopofojexum.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/36962034330.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/47207171316.pdfIn PDF document text
    • http://xycrusher.com/d/files/jimetobova.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/mivifuvazonofegilefovat.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/81415387515.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/95664229101.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6d42d2c42f66bf4c40f0b9d19c21de67/26420237594.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631186310.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/42334646376.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/boburojotevosofabobanoku.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/62204613381.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/suxesuguxukamol.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d15813aa---morasinetej.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/79177599394.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bamefimudosawivapix.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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 10492 bytes
SHA-256: 10a2f9a7426cba232604db9b18e21b05929485f7795b1d8c947ca91fca563e93
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 17556 bytes
SHA-256: 82693534e5878f6c561e602fd5bc62ab3ad2e18026928d523e33bf656727796b
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1