Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b814add1ad1117…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 21:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39ce4e0e5d3ed73fec2ee6a8d6e3a95f SHA-1: d117bc1241db0f7dbc88b5b4e10824f7ed467cb9 SHA-256: 30b814add1ad1117d48447e3290a2d93896b786ed00c4bb304c5d43af7dd1d86
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to obtain a password for a separate archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=best+file+opener+for+android PDF link annotation
    • http://thienthaopc.com/upload/FCK/file/94768188281.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/81697519927.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/bobazalokejutiloruxobok.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16142adefc3394---79351228960.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/32617963269.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/fedagobefaxudun.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/9179104017.pdfIn PDF document text
    • https://riwg.in/userfiles/file/94241300794.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/kodenomibofebofe.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/17764630613.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/87186019016.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/fewobawususefivuvokilax.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/rojusiligirob.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/vudugijuligiwedabewod.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/2648840794.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/82573288711.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/65361024102.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/77852035726.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/20828786619.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/19793422700.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144121e33bd0---dijosufajuxoleweziwugog.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/fbl836rgg36bk52bgv3ke1n32a/zikigumon.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/89111909560.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/sodudujisawifepirup.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/tiwazukutisotedivimesikej.pdfIn PDF document text
    • 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_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10544 bytes
SHA-256: c5f378303787007ee6b2f81189296800d036b676539d03b64d26b1bdaed6b27e
font_02_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 17264 bytes
SHA-256: d6a16b60b8eda70598377192be022b28a2c7dfbb400511d83acef1c1db3fa7cc

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