Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96f8400f9550abd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 12:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1ff77a02338f20ddf5494c98fdb9f31 SHA-1: 7673632cff2679d4635a68a08a31484bf01c099f SHA-256: a96f8400f9550abdb6e9aa7ebcd4f05d7f2d9c2d3d345c3b8794b80ebe91d00d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=virtual+android+for+ios PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/uh9v7sjkt8ej48tutd4qaosf8d/subenasurijo.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/jasabejozitafax.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/kizusetagekut.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/21587156513.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/basis.pdfIn PDF document text
    • http://tano-cable.com/d/files/79901717787.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/16051222913.pdfIn PDF document text
    • https://bolahijau.com/contents/files/88871546322.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/jatolilojabun.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bb7c3175---binokurodogo.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/79910989527.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/rovigifarurenipobuzu.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/55041459945.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/74685647244.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae50666d8---debufagevanulawaxitizogar.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/68390675157.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/87261865034.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kofato.pdfIn PDF document text
    • http://calisnt.com/uploads/files/27261017048.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/mipugirigawawisutuzavapi.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/64032507279.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631456534_1.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_off0000b138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 16688 bytes
SHA-256: 403e995cbd634dbccde591b3f037b2da74d5f6cf42f45c87ca16beb0dbed26e6
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10284 bytes
SHA-256: a982da03c915b4a8fb9af1ab90d3d003483401d704c8dc0bb81b3af0d338fcad
font_02_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1