Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec5676375fbb03c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 02:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d415a22fca46d04bcb58db659e545df SHA-1: 282aaa4f7cece3b9b562b0cf6fb777dbf4d91010 SHA-256: 3ec5676375fbb03ccf647368e29312bf27e3fe576bb85309e36c0cdcddc61bba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7424

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 https://philabc.ru/uplcv?utm_term=importance+of+computer+networking+pdf PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087697a780b6---33677183172.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d95436biecqlamlrh366cj9jk0/waxuzepudexumosekilasak.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/dupupekevi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/rirobinonunujegijojew.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/25045754109.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7705917a6---34515610535.pdfIn PDF document text
    • https://clove7.com/userfiles/file/87986109915.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/gelixazoge.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/kmg9talo7omganab50qvqd24j0/91020887895.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/tebedetokixupuvaz.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/14491556419.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aad10944a---89097994417.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/20760944273.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d18a46b91---45916635274.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nafijulelazono.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/bugifogotupo.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/12966889464.pdfIn PDF document text
    • http://recviem.ru/img/upload/xoworobutiwawejabuvubaw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kepedufima.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f12dc1de6---tevolololumubatariw.pdfIn 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_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 17856 bytes
SHA-256: f845b7c3f52f78a49cdeaa1b8314f9f7462a5a952d19ef7babc855ad1d52de53
font_02_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 10976 bytes
SHA-256: 470a5189aae4f0e953e48cfdaa8d199ada05b3fe4634b12e47082a163688b7b0

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