Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2246084d5a33e2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 02:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e9a65af4051fcd709bb7318805adcc1 SHA-1: 38d7e847258a8debda089342b18dcf4b7ba62eed SHA-256: 4e2246084d5a33e21c84b25a8a4fa2cf7cd003077a3dacd1f99b92e02b9b202a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of a link farm and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=2kit+consulting+screen+mirroring+pro+apk PDF link annotation
    • https://jamisonfurnace.ca/userfiles/files/vekewegubipisifeku.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/100354024.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/dejekadezifibutadut.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/74730945639.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/77716151081.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091412150973499.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370a5d569b5---jisejelevasat.pdfIn PDF document text
    • http://metzlerranch.com/userimages/69118811053.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dugemamopof.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/47006824900.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6f47effe---24365034800.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/34100498864.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/74563344506.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/nabupumilaxijijefumef.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/tetopesupotim.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613b087a186d7.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/pebulenositudefafe.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/70240987636.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/wojimito.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mijuromotodef.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/nabulelonomonej.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/45550921749.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff52f6de48---zegibiduwavotisino.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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 18156 bytes
SHA-256: bd6901109304d97c286ea4b624632904f688aed428e8a93c1ef8d92d14ebfec7
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10932 bytes
SHA-256: 14f979acf707cc1e470352555ed14dd3f7325d204190d7d6e73dd4f95a4c6a40