Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21ff767d8564fa8…

MALICIOUS

PDF

86.9 KB Created: 2021-07-27 02:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 418fff33f34f9af5d6ed7b98037f8e3b SHA-1: 560d5f524cfadd8de213ab6e95e70d62f50facc7 SHA-256: c21ff767d8564fa82d1d7e8bc53668e7882f9d6941f89fcb9b28e01169f6c9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://tvkinter.com/file_media/file_image/file/92429105978.pdf In PDF document text
    • http://paillasse.hu/userfiles/file/46438799383.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/54347624852.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/73360914869.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/podikutolodakiroxu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dac9775c8e070a6e90b5b414ccb918d6/65484827105.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b73e40a32a44ed07ddc7bdac3c921083/petepadodi.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5350ba15113eadb3a474ff59adf13b75/55661499596.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/r0ms3pj7lmm4sl85vocor9ncko/dudezimazogimapi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096239b01ddf---63129399709.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tmb9pa60nale7a1spqjiptj0l7/80963936979.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/79481050837.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/de3f5adb0fd427676f7ae3ad6a6977b9/9658432900.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/84435755866.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/65307113537.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/xumusuradagazer.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0lf4kn0qnsvsdeih2vhabcbgmc/66500586233.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609713fef2d53---ripanobo.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pibapegudafixus.pdfIn PDF document text
    • http://hrudolf.com/userfiles/10195416473.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/3811842396.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/70146380292.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073802555b5f---suvosimewixulub.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/qci7oisrdk425iq3tme9iq9uu7/4200765297.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe0345fe---livupabivonijojegamaduve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=chapters+12+and+13+to+kill+a+mockingbird+comprehension+check+answersPDF 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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 11656 bytes
SHA-256: 111d5b2e320b47e1af80d5b125beeae5bd2d61ee93d2c0ba226da8cfb7d26fd9
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 16500 bytes
SHA-256: fd90988a05e7199d00eb05bc157314b467ee345f4642b9b5b5aa39200a5c4018