Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c67d7e1c01b96e…

MALICIOUS

PDF

84.1 KB Created: 2021-07-06 02:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3eb85b1c50619fa6537d4202216c2725 SHA-1: 85419e34128420f7e0ed6a405e34dbc66747092e SHA-256: 26c67d7e1c01b96e9f3d59d1442f9b38d60c5773793edfaf37a9fe6b2a062d7d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. This suggests an attempt to redirect users to malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://silverstonedevelopments.com/ckfinder/userfiles/files/29541176802.pdf In PDF document text
    • http://georgekoldun.com/var/upload/file/3646587278.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/78319691112.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e815a8f6d837f3a717634f3337fbaf24/xivobemewojabuxalusona.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/lotajok.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d430ce2d28---mopor.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/73974106336.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/edb8b2fe133567f318f4a8345ab24326/81306391362.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4f6471c7---24577750115.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/59897896931.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c29706a4f09---23794813752.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/gamuluzamuneber.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/gegusuvamitutuzexawivi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e381c1483d6---16662572785.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9075ed5aa9---67488926293.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b15d9e4db---gubarutijob.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/13075438834.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/92828003017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bring+all+your+failures+bring+your+addictionsPDF 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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 17432 bytes
SHA-256: 833219fe99f5b261347ff9ee61b812ef7985e8edb62b3c2db9290ab29b6b1a40
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 11056 bytes
SHA-256: 4005555b4e76b3a4aa852f05e59bb395724438d4c5aa1684eda205ae05c8544a