Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c7770497e771d0…

MALICIOUS

PDF

92.9 KB Created: 2021-09-05 21:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb15f56fc67d104f51620bf06af0615e SHA-1: ff0f2ff1ac4f58f22a2b9e72188415ddf79daf8a SHA-256: 61c7770497e771d0212113572ac30a58e6f9d35da7cb9dcee55ae3de67e9dbc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lanofenelol.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/6c104a23f1b5e1bc84fb81b2a9684c42/xupefaletevozugomegurawo.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/rivenejurujodunaruvi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3ef444cdc---dadeberuzek.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/57662124422.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a523b4611cf---57880629719.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dopamefovaxutozi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4860f1b3---majobamixegozuwusudepakez.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f7d516b7b66e9d05dd5dae8807a7813e/48212894277.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/99068551810.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a6d39abd7d966bb169dd89c03019d9bb/penanuvamivowa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hu837vog2c80a5130lsgjdphip/sanabolejozesujuresatinex.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/sonugapilakalojefamowu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28c760eea3---zuvoxopupupisugun.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b3fe6c38a86eb7c061e96d3af1f4b556/86141599468.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e01131257284a8879a9fe6acbeb15a8d/xijuxijotemofedijixuso.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b480462bc8---vogiwev.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/622f88a2e168d4197c3cbb57f6238bfe/zagemuzajilinoma.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/dosetenumejemumawobuz.pdfIn PDF document text
    • https://activepymes.com/pub/file/58755166177.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/32208560921.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee7b3cdb92---8642959683.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a600993ee791aecc53055d0eb8d3ce9c/fites.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/dojenabifafebinon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bible+study+topics+tagalog+pdfPDF 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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 18424 bytes
SHA-256: c10b0b46db2c80c8c7404226244d2c7d5294c762452b6e396861d87a00668743
font_02_sfnt_off00014c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9C 11000 bytes
SHA-256: e158c96ca9afaf888101aaa0c7a78cfc7c56271a24d8e3e0ba7193be98390125