Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd5765ae27377ee…

MALICIOUS

PDF

78.6 KB Created: 2021-10-04 16:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9eafc4ed49b7d3b7da34a552f0d451a9 SHA-1: cf90fed37089c383bef7dc8f52edd7f4e7d87974 SHA-256: 5cd5765ae27377ee211ff4a5850692f7c21bea928a6c5ea9b4c360ebfdc50728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and heuristic firings indicate it's intended to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://apartmany.cucoriedka.sk/data/files/tilajen.pdf In PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/81140019892.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/falodutekugesasazunulas.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1ee9ccd379ce42c82429d9e5ca387c1d/sidotijiwi.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/78133516588.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/10823327442.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nifawelerupubojekiwetum.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/ribinuzer.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/76842403337.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/4323516304.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/11745765256.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/namelalufokifibuj.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/87439846426.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/62874332197.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/rodewe.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/molizefeto.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/56488918051.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/22365107047.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b33931b3b36ff94ab3485dc4798263c6/towelij.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/37023176391.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/34262600240.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/43397223949.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614549f17982a---gatobisubobedipoxafovan.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/65068325637.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/34528105345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=class+6+computer+questions+with+answersPDF link annotation
    • 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_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 19196 bytes
SHA-256: 776e4f141d0feadbfce161e4c09054b497f52a825c8fa3365eae172e75ff17d7
font_02_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 11172 bytes
SHA-256: 74d716df1f32419f08081c42ccea923b3389c6fe81db1677709369090d31245e