Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9bfc86560135a0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 20:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aee73cdb8b2ed2b9c60810dc5f4997fe SHA-1: ee4382bc5e9e386efe21f13f99390dcefa1cfaf4 SHA-256: 1f9bfc86560135a0eec7dfbbf7b6b512819f11208d6d91e6df82b1e520e3b15e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggests a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crewmak.ru/uplcv?utm_term=spongebob+moves+in+mod+apk
    • http://medicalproduct.hu/images/files/1525739916.pdf
    • http://lycee-elm.org/userfiles/file/60878270632.pdf
    • http://stellarp.com/userfiles/files/33610920572.pdf
    • http://sciattella.net/images/file/fudopelujot.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a6e724d17c7889362a3cd69802f11617/11931200055.pdf
    • http://erfaspot.com/resimler/files/17254579051.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/48e7ba3b19e16d40e620fcd8a4635530/tanavemijusemalivudufuge.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf08734f1a---87010891276.pdf
    • http://easyhypermarket.com/userfiles/file/64303006825.pdf
    • http://sromedical.com/file_media/file_image/file/bojuboz.pdf
    • https://noticky.net/akce/fotky/file/mazupamujogexitodilika.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba01e9054---43998186049.pdf
    • http://mega-gold.com/userfiles/files/vavepibaduzaw.pdf
    • http://nuestratierrapremios.com/campannas/file/34088273827.pdf
    • https://stotex.rs/files/nanexubunawosagolu.pdf
    • http://interwork.sk/userfiles/file/96561222058.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/metijemukidubugu.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/nitedugako.pdf
    • http://pileshoppen.dk/userfiles/file/zesamevebulawa.pdf
    • http://skulpt.in/admin/uploads/file/20270443565.pdf
    • http://lawngo.net/fckfiles/kinajuletevorijilidin.pdf
    • https://majubesar.com/contents/files/magitotuve.pdf
    • http://pronobile.de/catalog/file/xoluvimepuwawevomode.pdf
    • 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_off0000e20c.bin
17440d171e43771a94eaccac0eb428823f881ea3a3ffdfe2409cd263fef197f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 10864 bytes
font_01_sfnt_off0000fab0.bin
5e4b51491b2bd35d6171df2afed59b5e1b7ce004f9821d179e6afe5e91c68215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 17288 bytes
font_02_sfnt_off000127db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes

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