Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c892d75767f7567…

MALICIOUS

PDF

81.5 KB Created: 2021-08-10 12:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f09dae2f0c8d5ee6fc02fdd8a9f989f1 SHA-1: 9f853c1a78363c930b3d6e65ad259881a7e61949 SHA-256: 9c892d75767f7567060b2e99d280e50dcd395bc946301a525d88291087ccaae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a285a91786e---remodiritasepativa.pdf
    • http://adamlegal.com/userfiles/file/40129226436.pdf
    • http://sadiqandsons.com/userfiles/files/zogikepajonegonununed.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fd4bad082---48368576320.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0b0a364e4---65273441717.pdf
    • http://nhs1980alumni.com/clients/878257/File/lukeruranurerufetada.pdf
    • http://xlsferrosilicon.com/d/files/ruranag.pdf
    • http://jullien38.com/ressource/site-image/files/70484875519.pdf
    • http://apsencollege.org/test/fckeditor/file/xotor.pdf
    • http://traktorpulling.de/ablage/userfiles/files/tibakolofav.pdf
    • http://newtarrytowndeli.com/uploads/files/66576197648.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/semivudowaxu.pdf
    • http://ruihuitax.com/files/file/ladebesaxepala.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/99583341998.pdf
    • http://falerisztika.hu/tmp/4907443800.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d59b040b---jigoru.pdf
    • http://primaria-ciocirlia.ro/media/file/1974973083.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f643924cbc0---25316318468.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/d391d61edcd670c0e19c78051e594ebd/2078913507.pdf
    • https://viettincapital.vn/upload/files/40296358931.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4e812e02---rusixurunigevoji.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2783e946b---70022125721.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cdda01f39---70118837273.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/74088765593.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l5tkovr0nas2ohf366788tmsoa/widupe.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/44624657014.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bimco+voyage+charter+party+agreement
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 16792 bytes
font_01_sfnt_off0000f37b.bin
11498ca4b29e37d3a4955590d7c9fb1e2eb9c09d8054d3cf1aadc2a23aad0c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10840 bytes
font_02_sfnt_off00010c61.bin
1fcf6a6521daf2c0df2a2b8a313712ed01d8223bade1bdd9fc8d113b20bc5c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16472 bytes