Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b8b0451018b808…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 20:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6b30ea5861bc80f179e039a0d70d249 SHA-1: af90f73644867e148142e9087629e3690e3ccbe0 SHA-256: b7b8b0451018b808bab22f57a993365b31711e491b18203367b054e51ddc82bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://nomylo.ru/uplcv?utm_term=lootcase+full+movie+online PDF link annotation
    • http://rs-entp.com/upload/file/tovemodo.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/72528653945.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sovupadasili.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/32804e979662ffb12d20055fdd7ec927/89944768380.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/vugowujosutelesixugasew.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/52321607109.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/90130459173.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/82685976705.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/35892314759.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139dee79ea4b---toxab.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/sefonenawes.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bafc6b9bc---tomenoxoko.pdfIn PDF document text
    • http://strandedtattoo.com/file/popase.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/naronatutuziregebuz.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/bizomaro.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/22812039583.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/44603984750.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/83699552790.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614863cd2b061---mavajanobumofadas.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161441aa81e66e---58444436748.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/bifawokov.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/niruwowegebim.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_off0000be53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE53 10520 bytes
SHA-256: 65dd33b96ce732c1b5f767187aa6a738c54924b73c8737c47aa61d058979b6fc
font_01_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 16696 bytes
SHA-256: 3ba476a3ecaf196c62a0d1c08020f1977ed233dc4a7c3d932af0aec7dcbcff43
font_02_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1