Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb6ab79be3483a3…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 18:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 917d648c8e54c268f057ab52ac95b43e SHA-1: 9e0bd615cbcbc21de6a32c61a86901ccecd0b258 SHA-256: ebb6ab79be3483a39445d13e89120ea902b59cb4599a2393d0b086f8ab203cc9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains and compromised WordPress sites. The embedded URLs and link farm structure strongly suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=font+for+my+phone
    • http://myphamnanyno.com/luutru/files/vominoledoxaligezewatumiz.pdf
    • https://harkakotony.hu/UserFiles/file/74095344285.pdf
    • http://korsorlampang.net/user_img/files/regudaligisi.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/56430858363.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/mopeliroru.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d875ce983b---movuwofigo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614d22bd2158f---lotewofijow.pdf
    • http://hyunsin.net/userfiles/file/82589635436.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/27504952940.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b44edbb5b3789841304b3f3eb5ec4c9b/vaguvoju.pdf
    • https://aydin-elektrik.com/resimler/files/47482698472.pdf
    • http://metrocars.london/survey/userfiles/files/roxofevabofakir.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/27c0956bbbeb657d47a50d4d2fab588e/litiveselegop.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/16335934044.pdf
    • https://partnyor.az/userfiles/file/gasudinubuzekuperi.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c4dea39c---1399944873.pdf
    • https://tyeetomsfishing.com/userfiles/file/bizofedenu.pdf
    • http://cwpni.com/userData/ebizro_board/file/dezakasuwadinabeg.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b29bd50d7ef44f1c3153e3359f93ed0e/vuruvupigotawijanulexetur.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///ninaresilikew.pdf
    • https://serihosting.com/calisma2/files/uploads/50941886569.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b43101b268---jijibokozezisag.pdf
    • https://sunrise-photon.com/upfiles/editor/files/10062354219.pdf
    • http://pphjako.pl/userfiles/file/13258386788.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_off0000b0d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 16792 bytes
font_01_sfnt_off0000c8e7.bin
af5eaa48f10a0cb1d5bc5cd30b07ec09ac29110adc0240864cc5fdab327e67a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 10244 bytes
font_02_sfnt_off0000dfbd.bin
0258329ce608b01e920940e016b5f52aa1de3a8eefd6fec483a14066701afba8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 14764 bytes