Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78d9c88993a85d7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 08:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b569d71cb2de36727e28035eaced7364 SHA-1: 36adc5d010cc8e36cf4f6b6c533cbf7821f4f3b4 SHA-256: c78d9c88993a85d70eda90d3dd23b1327b2555bccb71663f20ad10a05439382a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607de251aba51---daporefimimos.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a3965a5b---kerotazapefezovukudeda.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/10246133658.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e000895c---65282732544.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/79790352551.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1b8eae2f9997931a8cacfd8087f318e8/3632266002.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/87b8b19b4318cc6b7f05255ff6e63fbb/48135822584.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/62102237630.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/batemexolixop.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac363caf4fd---tumotokab.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee73cd7a58---41170035781.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/47345165949.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/55766496797.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/samujepogorojibu.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/20205808441.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/71729495660.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/30781799668.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c447730c---68295862579.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/69345149179.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6672a045bf---39801118987.pdfIn PDF document text
    • https://ikansambel.com/contents//files/penometejiketibuwulebilox.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sazemilo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/82544715886.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/wusiropukixepolagovuziras.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c53f1dc8069fd4f6b8aa18578cb15332/78936281948.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/bewolomuwaxorubatox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=radmanesh+microwave+pdf+free+downloadPDF 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_off0000bda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA3 17780 bytes
SHA-256: 77ae899f2505ae4d62eb41a7c5184bf90e8bc15e2f6af6ab1c53e69422a1f069
font_01_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 10984 bytes
SHA-256: 9044aef63c0089598adfb37b64c5554b61912df617007ef72e0b5ef937bac2bb

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