Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f86f49b26288ad0…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 07:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53bda09c1b0d65aa2e5ca80db616b99e SHA-1: 965120769057b73055929e5db2fd16201b30a223 SHA-256: 1f86f49b26288ad0b706e92bbbfb3689e0e200b2993d45a25a0622681226e78c
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://anninh247.info/upload/files/72288976549.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3294d6909b6df269bc5fc80bb28d04dc/sidebotapolituzanozuz.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/wovewarupe.pdf
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/88708147505.pdf
    • http://www.rpv-drachten.nl/files/file/92743149277.pdf
    • http://exima.kr/userData/board/file/rofexogubese.pdf
    • https://voyageaventurenepal.com/upload/files/55822911445.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/62356495973.pdf
    • http://qiuyutv.com/userfiles/files/20210825121754.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/xasunokevuwux.pdf
    • https://dienlanhhonganh.com/images/pic/file/kutovukutaxeripavujaxejo.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083d221b87e0---18816935142.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/47ov56o1comsvk9eob49873c06/76057292590.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941da186814---72196842056.pdf
    • http://gloria-eurex.com/82406117221.pdf
    • http://rilta.net/userfiles/files/wojezogotegubofano.pdf
    • http://kulturazebrak.cz/userfiles/gepebag.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c21c6f030d66163b95e9d22b5dc49ac4/siwikiledokosoderesubef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=consonant+blends+worksheet+for+kinder
    • 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_off0000b536.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB536 16792 bytes
font_01_sfnt_off0000cd4d.bin
35689be8030c358651733a6152db176ad108cfee6525490c2bdb82399dae88af
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 10800 bytes
font_02_sfnt_off0000e63b.bin
1a822510027fae11e937ca4c03d76a0964ba7188e5f26cf8b202700603d2db46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16368 bytes