Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ff8c05a9b0744f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 14:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da6208d6de7bb48dc107b31786e900b1 SHA-1: 74ab3b59757dc8f4c3f81f3a2d7dc1506e2167be SHA-256: 08ff8c05a9b0744fbf1a974b30b728aefe007cfe6d1977efd8bb90f6467cc651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://songiadahoaian.com/upload/ck/files/69128937233.pdf
    • http://dui-antidote.net/images/userfiles/file/wevujusarupo.pdf
    • http://abnig.friendship-match.com/upload/files/10406301266.pdf
    • http://www.parinet.fi/tiedostot/files/76497711026.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/dedaxakufuwofarogi.pdf
    • http://alphamarino.kz/images/news/file/92474759889.pdf
    • http://net-marketing.hu/images/files/sebulekawesovesaxavuz.pdf
    • https://asiantms.com/ckfinder/userfiles/files/31408191894.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/jiminalaxuwifakoxokovu.pdf
    • http://karpatskiles.ru/store/file/fikuzex.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4e8e875b---97025989088.pdf
    • https://ratosatu.com/contents/files/damopozasejomewurofomij.pdf
    • http://refpecsbelvaros.hu/kepek/files/84154868119.pdf
    • https://heatingboiler.ca/fck_upload/file/69394977964.pdf
    • https://ddc-touggourt.dz/ar/files/witoxu.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/laridamenenusafu.pdf
    • http://belniig.by/public/file/90476917911.pdf
    • https://dortmundpools.com/contents/files/dezazukasibawumetul.pdf
    • http://boschvietnam.com/files/usersfiles/files/dasifebirigig.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/dimeziwexer.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614011c664804---majurazotaderexod.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19c0e94e6---xevilajijasufo.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/mebekuxuzowa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+quite+place+2+free+download
    • 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_off0000b899.bin
7a596ee8145b679cf74f5fedd3e4c591d372693e15906d47890c1e6df7fa6c19
pdf-font-stream PDF embedded font (sfnt) at offset 0xB899 10876 bytes
font_01_sfnt_off0000d1be.bin
80ed6a10b5245b8f31374cb0772290dee78b7916a1f9547fadee00ca0e202940
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 16272 bytes
font_02_sfnt_off0000fbc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 16792 bytes