Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e52d9002f2667c1…

MALICIOUS

PDF

112.3 KB Created: 2021-06-14 23:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 787670c5df435d4d10a8fc036947a424 SHA-1: e59b5b57f5101426109fb92848a438dc30c1b89a SHA-256: 7e52d9002f2667c1f8a911e39d403bd2b547e969537105933c00569891332468
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/uplcv?utm_term=a+christmas+carol+comedy+script PDF link annotation
    • https://aradovan.com/userfiles/file/jepoxuw.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q6kmagmdstlh44vdmr5o9dsov0/35517670938.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc933919ff7---varilumofedevuxapepubetet.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0b93a761---41811788320.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/namuname.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/78834375386.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ha3fbmlqncin5mrhctldnre5d6/66781761084.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5bdf24f5e4536aa0639c0c0866701fff/kimixirevegikisito.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8610a3d754064de579e546d257a4ec21/bubemejudi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r67vd1n87nceun8baiseocunh0/fuzenana.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/josezoga.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c806d0eb---zerekixovi.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845527f3571---xalopoluju.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/35054564296.pdfIn PDF document text
    • http://boxethai38.comupload/file/69529105839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000166b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B8 5404 bytes
SHA-256: b8e8bf837f8baf08a1b93d0af874cd76401c0cb6e0466a4d733746ebf1550604
font_01_sfnt_off000178f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F2 10540 bytes
SHA-256: 380f89d3f7aa60c286aa89ba60faa9ecd6906b652e782ea3ce09d522df574df6
font_02_sfnt_off00019d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D09 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd