Malicious PDF — malware analysis report

Static analysis result for SHA-256 9978aadbae858100…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 22:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcabef6bb45c7c0cc253130529495d2a SHA-1: bdc89a142aecf9b9912f2e77b1fef2b4cfb3fe21 SHA-256: 9978aadbae85810071cb0af4db22c5ba8e144d4517e2322e2d11500dfd40b0c8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

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 http://1544-7419.net/upload/fckeditor/file/37774897666.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e6edda8---jojigoxorojijorivogajex.pdf
    • http://pphu-joanna.pl/fckpliki/file/fejavaboboxewafakojunuti.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1a8a4071ac468eee2c0a14523849bfa7/87643500551.pdf
    • http://ydchem.cn/filespath/files/20210905001616.pdf
    • http://xutricolor.com/uploadfile/files/tutoli.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/19097475512.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/17580602131.pdf
    • http://manavpublicschool.org/manav/userfiles/file/77592879609.pdf
    • http://nexxstep.nl/userfiles/file/pazujifazirewirobulumiz.pdf
    • http://changrung.com/ckfinder/userfiles/files/xewuwozonipepaxokasagepa.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/zuzugarekeberiba.pdf
    • http://dorapeyzaj.com/userfiles/file/3278648963.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/pikigubukezeluduvus.pdf
    • http://teplospectr.ru/images/files/31214865171.pdf
    • http://tindangnhadat.vn/upload/files/65044727261.pdf
    • http://bluecars.pl/userfiles/file/65453120229.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/55690846237.pdf
    • https://www.ruchya.com.tw/upload/files/34747279383.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1c67959c6---vabojubuwiru.pdf
    • https://nurdagihaber.com/resimler/files/savetarebipodubojopomudab.pdf
    • http://kvarkeno56.ru/userfiles/file/6069289820.pdf
    • https://pernambucoimortal.com/imagens/files/dowumosamogulabod.pdf
    • https://locoffice.ru/userfiles/file/bimazomajelizobe.pdf
    • http://ecilingirler.com/resimler/files/76468193878.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mobile+mania+mp4
    • 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_off0000dcec.bin
50fbfbb99572348e9110c346e155fb26aecc629ed3236989d338704b7da49f49
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 18020 bytes
font_01_sfnt_off00010b8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 16792 bytes
font_02_sfnt_off000123a1.bin
2e4b2092da24e321aa22c615979364ea1eebb822cc106f0320430a1a504cfa91
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 10256 bytes