Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb5fee79fda691a…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 13:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d5dc8b758d70e2d77f57091972fbde4 SHA-1: 715ebf7549c3f4ae8ba2d484ea288b83b383563f SHA-256: fcb5fee79fda691a368b63dcfc105ea0608c5e90dba57c0971298b74ffb0f4cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca49b2a47e---xafekuwu.pdf
    • http://www.sealjet.mn/pictures/files/3407363311.pdf
    • http://centrons.com/uploaded/file/114371602560c30d188c318.pdf
    • https://bajrahrs.com/userfiles/file/gibamidikosud.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701b91e9ba2---10928560106.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ksvqua2l0ledeph4a1rsdnh4og/99998774472.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/64500660450.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c26f8177c3d---28320559936.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608610ebf191d---55966710000.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/98478360711.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/k9rfc0flpknobsjjo68dj3i0l3/67309926375.pdf
    • http://sola-brothers.com/userfiles/file/86315870730.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a018a248---80285702760.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/913ab33158b86c0e6347be9c66324e45/67834849930.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e623573b5---vevidipukedezutogebudovi.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070b266e4997---kefano.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jhlisnfoortamdkksl877hejr2/ganasodabazasedolanupat.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5698b1d59---64033990327.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/jazikivesitipa.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7ca331cd---sazilubirik.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bb906a012df---49139907877.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d857842e6465f5a03edc521fc36953fd/pejivixagodamavazewepufa.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0614027f---basovefurufurutatex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=one+flew+over+the+cuckoo%27s+nest+theme
    • 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_off0000ee4e.bin
297b67d31efd9b57e78be899f3750316768b2332502a21c419fcf7123484eea9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 10748 bytes
font_01_sfnt_off00010709.bin
c5d93440a1f3ecc74744eb9f78372b8ba338d3ab71758b56a1d39a1f2d089fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 16376 bytes
font_02_sfnt_off0001311f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 16792 bytes