Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf2a63dce638783…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 08:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9994b15438fcdc989af7b1222cc4d185 SHA-1: 1ce7a5dbb85f194676a95b3c847ce7f2a434dfde SHA-256: 1cf2a63dce638783ba553d273555164f3fdf5c0b92d59959697ed1b28a1f609d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous unknown-reputation URLs suggests an attempt to distribute phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=wrestling+revolution+full+apk PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffd3937cd---44764405808.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/39c9d3f5745368b5a7e286dfd05baed7/87862671162.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/90969798345.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/zalobapanaku.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jemitenaruzizitu.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/kewovivebinojapotafel.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210916/16317273578249.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/waninabidukonusule.pdfIn PDF document text
    • http://52963566.com/upload/file/202109011255540600.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/rowuronofap.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/rojejizosevexik.pdfIn PDF document text
    • http://belv.ru/userfiles/file/rezalazaso.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/44671658495.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/bosugagudofikuvoboxobevo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee5a4c4e8---64160977633.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/aqs2o6j4jhid9qa9vfq7oaj9bc/nolofanipokasima.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/zikelasawaviwumamom.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/5829978179.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/27375303247.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/najejidixevuripisubedut.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/21418608862.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/78685145806.pdfIn PDF document text
    • https://negaratoto.com/contents/files/22660603769.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/linowanamitixi.pdfIn PDF document text
    • 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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 10784 bytes
SHA-256: a3f7601a2feeaf57b4d05629ece631b28af4690a8f9abc7fc3df0d8a11b2f95e
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 18200 bytes
SHA-256: ed37b43aac2358e8181957d65a0566a21809ee7702fe3649faef3b3f9c176c25

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