Malicious PDF — malware analysis report

Static analysis result for SHA-256 490947a864b0e961…

MALICIOUS

PDF

134.8 KB Created: 2021-09-16 01:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e9c1b8662cf03eaaac77c2ee65729cb SHA-1: c3b3e0a5a4e73504b1d2a1d303f9fcf11afd67c1 SHA-256: 490947a864b0e961d2fcfe5500a8a8844bf91a972456e07d039f1beffe2216fe
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jetaime-shop.dvsportbg.com/files/65176804954.pdf In PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/6531939084.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/barovozifuji.pdfIn PDF document text
    • http://th-hl.com///upload/files/87895107170.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614095726a2ab---zijunaramemibafutijasafo.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/powofukixowe.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/mupaxibunejopavotuxora.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755d013b0a---pirini.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/giwoduvozamoxigawaxo.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/59134179582.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/disali.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ae487ea0e182996ccad70f728995395a/gawumatapelusovegiladusav.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/lutidepe.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/fobudeladebomu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///suzezu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fukewe.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/nivipujuse.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/basewujomotim.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/30370532223.pdfIn PDF document text
    • https://telorgabus.com/contents/files/kakadunamitarojovep.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/53378089236.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/javesofitamipafid.pdfIn PDF document text
    • http://kgmda.com/upload/files/14236222410.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/wufolosefubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lux+auto+brightnessPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C16A 19360 bytes
SHA-256: d30ac4f07d262aad3234c21b3e77157c1061bd2cd595f6696d6f86d01fe46821
font_02_sfnt_off0001f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4C0 10640 bytes
SHA-256: 06f1f34e6e4a7d14600a33c1265884be15e156d49eca0d287db0b1bee3e7f29f