Malicious PDF — malware analysis report

Static analysis result for SHA-256 69428c50cad0700b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 07:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b0c43d01e4cd26bc4e18fb1d8e2e26c SHA-1: 2c23e44ed3cb2f033ce72684ebe1e274d672a6b9 SHA-256: 69428c50cad0700b8420ffc737e486d513a20eac1f57e7017b598cbf4d9de3f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://heldermusic.nl/ckfinder/userfiles/files/75651260259.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/omt2foj6gi8q5uubdkonn2bok1/65851554877.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/lufopagavabuluwukezazor.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b00c2c159cbf15ba225ce4c5f24cb874/pedaledizigerinov.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/fetutunixapakojakorina.pdfIn PDF document text
    • http://dogable.de/userfiles/file/jiregipufavuti.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fa9c8071---ladig.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/voninedifiwakanax.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff9e74a42---xuwulosakituxipifijipow.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/46192823581.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/lagurawoviza.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/db0f830267a26c858e3fd229ad2bf8b2/fisidojavig.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/49584373786.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/misurulewefobikanelije.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/2031220245.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/20508380172.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/89217719069.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/gizotidojovipawedufudiraz.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/30c276a5c6ac92842e7ff4fd10c9734e/27747521127.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/v966rhtu7825r74hei4jvd70ti/17417803964.pdfIn PDF document text
    • http://jp-cable.com/d/files/64786131801.pdfIn PDF document text
    • http://edgecs.net/documents/74401553627.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c582f9a9030---wosunud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=a+narrow+fellow+in+the+grass+summaryPDF 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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 17720 bytes
SHA-256: 0dd32d53a1a185665f910ba9a9a2a358648c205bc017cbf925cfd1824ce48334
font_02_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 10940 bytes
SHA-256: 3e661d57410f935e936083255caaa9330e862f3b61eff7e055cd929d0f06be79

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