Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c19cfcf1a3e5834…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 13:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3bbb91613bd1b57e1134bc6ddcde165 SHA-1: 0162c8875ad31d326910140947cc63b9f125ada3 SHA-256: 4c19cfcf1a3e5834a73502e7b7a5642c3d4d0f8ae849e4c7d69d18f5a15b3e9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, designed to direct users to potentially malicious content. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/24220148031.pdf In PDF document text
    • http://0851gay.org/userfiles/202109file/2021091404215770554.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/849321166.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/lijolanavigideso.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/15593866883.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/gukejidefobigexozokeg.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9222a188a8d5ab435e1b0869d1c0e143/sezujomazigetidibiwufasux.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///885401739.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/mewuzas.pdfIn PDF document text
    • http://pmke.cz/pictures/files/naxaropokurukapitezegiz.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/bexevenamuvexuraxeka.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/orh4r5qd7albnujaikfjf7did6/suleneguzar.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3e58fe4a69c221597c46cc89edcff1a2/bawamebovijifixulunaziran.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/45638274062.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/99728334162.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/fusulanerovipanit.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kawalofuzerubifip.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/91523017258.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/43660442472.pdfIn PDF document text
    • https://icbacademy.com/upload/files/javefadelikidopodaniko.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/7335161312.pdfIn PDF document text
    • https://tmtteks.com/files/zojeguresoredinuvurekiz.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/goletujerezepewa.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ba33ea93---disuvidupinuponesozorop.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/fegabofufagotesibix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apps+for+android+google+playPDF 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_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 17700 bytes
SHA-256: 46b912b4e57b9de668881f1d088e0f0b5dea9108237947c912913ac032383726
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 10672 bytes
SHA-256: 8d1a444ce09ecf68b612a02ce86602c23508fdaf73a5148508b4816507cacb8a

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