Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff3735c5c86b625…

MALICIOUS

PDF

88.9 KB Created: 2021-07-03 00:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17fc4c985165f7ddc7ec48fe4a2fba58 SHA-1: 5a5f4420312051d677675d9b4f47c7ad6e99637d SHA-256: fff3735c5c86b62514586d0ae612d1f15604c751618379c65ca0e6e05a4a7ea1
204 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal multiple links to external sites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kiuruvedenlukio.fi/tiedostot/file/15817361920.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2822dab4fb---12263196734.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43473dba7---59615765936.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d158e34a35539f629f6739a5acc7a711/difog.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fl2t9l9e445ir9jqaujnm31if9/81665534738.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/595551844db08361b8a0a59b5b336cd0/92123264027.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cab36cc4f---xotokazirizipuv.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620925401.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dunepixegovesafo.pdfIn PDF document text
    • https://baptistfriends.org/media/91232859107.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k74b2bc96d15g3mo3g4jueefm7/85294111176.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/pezinomadafotawov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16d3dc511---2526693361.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/41004343852.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/95871285505.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b28805a95984bafc0d009612906f5a5c/gubiporaxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d7789af4---fopumamexas.pdfIn PDF document text
    • http://allasclub.com/campannas/file/47541478036.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/87ed753ebed26c972017619591e4dad2/50142544305.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/9ff8020cd7758aaf338ae25a8bfb66fd/30420468066.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/99793858248.pdfIn PDF document text
    • http://gdaniec.com/upload/files/60039007046.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/midevefugumerituwimar.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083840b9d9e6---77057821180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=reasoning+questions+and+answers+pdf+free+downloadPDF 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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 18564 bytes
SHA-256: 0ff596fcd62e0d3e8012486c6f94a96b96ef260c2aeb6e422eb3a7e1166a732e
font_01_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 11048 bytes
SHA-256: b8cd4d3473f0fdacf0004f77d954fd7c335731bfac537b23afdfee76a55cdce0
font_02_sfnt_off00013bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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