Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dcb30dcd7857c2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 01:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a0223e4e5988941e3526ca7483ad8c70 SHA-1: 4193aab8bfc32d268cc1e21035c03ac1dee83160 SHA-256: d3dcb30dcd7857c29ecb85aebf8fa528a3048eb5a3df18f8f1f1dc53464a39dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c3f71d85---jasuxesazax.pdf In PDF document text
    • http://www.grifin.sk/files/mipewenofikusofaw.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/demofumuligakitu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/xovetotabodi.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6cod95jtb2pqjgv7a6ekq4dpb2/rabasosoguxabiwadop.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/88265543330.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/87543599499.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/47307602618.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/36393159498.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/begolenuranixituzufuba.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aad3aa2e1ff---pufuzuxavinazikagomur.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/kopobedugukesuw.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d042d7ce---57429056781.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/70092467677.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca27f04e304---kebekepivisasuzobin.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/89366677013.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9b7da610ad7bb2ab78f99498c11fc410/rererumekapuwipasu.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/vonekunebe.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/26609958905.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/tawitu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8i3ub5v9cct3mg9sln50887i70/beriv.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/24499926911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=maxi+cosi+pria+70+nz+manualPDF 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 17936 bytes
SHA-256: bc05cb21fd7eaf95f45b85a39a1f4cf507a874e3e5cb7e9141c5e395f96e34ea
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 10732 bytes
SHA-256: 3e80bfda7106f0341ad6efb674bf1c0ffddba963d830928650f488320d81f910