Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f3de2fd6c45858…

MALICIOUS

PDF

84.3 KB Created: 2021-11-08 04:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fde6d0fb9682186e8ad0ddbad0605e6c SHA-1: 80e2160d2781760c648769e2d77180cafddd10d6 SHA-256: 70f3de2fd6c4585810f452231f4c56094452b755a95c97fdf17173a0a4b514fd
186 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised CMS upload storage and disposable domains. The PDF contains numerous external URIs, with several pointing to potentially malicious or unknown content, suggesting an attempt to lure users to external sites for phishing or malware delivery. No scripts were extracted, and the document body was not available, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lbjgold.in/ckfinder/userfiles/files/rapaxelubepi.pdf
    • https://www.naabelectric.com/userfiles/files/fisut.pdf
    • http://eprdel.cz/userfiles/file/93105259617.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/86209140479.pdf
    • https://noticky.net/akce/fotky/file/kisesawotar.pdf
    • http://mhinflatable.com/upload/file/zejupolu.pdf
    • https://verticala.ro/images/userfiles/kilalimi.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/98080442066.pdf
    • http://7m-shop.com/userfiles/file/35575307864.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161743eb4275e4---50337738550.pdf
    • http://haki.tincorner.com/uploads/files/15112504018.pdf
    • http://kino-cosmik.ru/sadm_files/sagegomoruzobazuz.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161515bf611893---56258855371.pdf
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/81564923448.pdf
    • http://av-jet.ru/userfiles/file/77100267864.pdf
    • http://creative-format.com/upload/editor/files/76713755874.pdf
    • http://kcpsystem.com/userData/board/file/luriludazutogirusuxi.pdf
    • https://palcev.ru/userfiles/file/87837380003.pdf
    • http://severstroysnab.ru/userfiles/file/paluvurenifesezom.pdf
    • http://ingegnasrl.com/userfiles/files/31027101673.pdf
    • http://turnyras.lt/Files/file/89020423629.pdf
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/pineb.pdf
    • http://surtek.biz/image/files/20150430_054116.pdf
    • http://kmkonsult.cz/userfiles/file/18272161236.pdf
    • http://koppeika.ru/userfiles/file/motogademirumun.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/64076107648.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161669be750956---ziwapawalus.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=gksolve+current+affairs+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de99.bin
67e657b0b9bf0dc49b52fcaaab4caefe480db3457b052d29e283dc8eb629abd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 11996 bytes
font_01_sfnt_off0000fb9b.bin
45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 16540 bytes
font_02_sfnt_off000112bc.bin
e1a1c53c5826efab8a41ab6fafa362311ac6c33996897ddc1f8431b04a1456ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 18672 bytes