Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b7d6dfd6fdd741…

MALICIOUS

PDF

84.3 KB Created: 2021-07-22 17:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0188af0a5da99b627c700ad720562e99 SHA-1: 76c55a9cd96c7f6641731286f5394e1bb75d21e3 SHA-256: c8b7d6dfd6fdd74140bc5d659a2f6f19ca169d5306dca9c0cf16d36d896a7cb7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://zulassung4you.de/bilder/file/wexusokenizarufagu.pdf In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded8532fe2a---4833966830.pdfIn PDF document text
    • http://ore-processing.ru/d/files/lenunakuxadudepatefij.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/dufomireb.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/13948701127.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/56711506161.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ddf0d91c6c4679d49efcdda02b681b53/74184894210.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/torub.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c89bf831---15230682436.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/kejaboxebufem.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda9c1d399---7499982011.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca7c82731---tudosagakigaketaxujiritun.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/74178024301.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/tekebabuk.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/65853496030.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/xidukugeweridokonoxolene.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021621642467337.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/49340131118.pdfIn PDF document text
    • http://haphadoor.com/upload/files/83378946635.pdfIn PDF document text
    • https://ikima.fr/uploads/file/jukejediwajepubizexijew.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/70892392577.pdfIn PDF document text
    • https://luminex.pl/upload/file/62424463603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=simple+endometrial+hyperplasia+without+atypiaPDF 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 11032 bytes
SHA-256: b89ba60d4fff88348161af0cc0a4304372bc68c773d70866115377306cbe2a1b
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 17972 bytes
SHA-256: ba6d7f682d15623d8f5f6d287288dd774964ebebfe8c687a13ff55b6fdedbd83
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1