Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0d1e190a5e00f2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 18:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b78bed34ddd1b6f71db34a8daadc5f8a SHA-1: e8277932b7681bb4a1b3bc36ad6bcef621de21e1 SHA-256: 8c0d1e190a5e00f203b4032a5e978b5faefdff1fefc7ff4b40abc73dc4b0f943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of external URIs and link farms indicates an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=edward+bullough+psychical+distance+pdf PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/lm9a14b61oiadi01cbdma5m6v4/50579084941.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9c4d66e240e8390f9e5c974e18e0db71/dilorifelizibomiwa.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/16159996662.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vnrk9k2g92s5f5o96el573n2b5/parulegarumivenubexofal.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a131f3cdc0e---bosewubiranolupizezolefux.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/20308409387.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1d5022a---87620176550.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd024a6e8f---56248853288.pdfIn PDF document text
    • http://abworder.com/uploads/files/zusujirulorofasokuxaj.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c898a27d3---dawadafalawujunizojabusev.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8865bcfeb9df070357e11a5240c06e8f/16023079514.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522191314656.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/17266704992.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f0601624---42911031512.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0b9fb03c490cffbdb74483a6d4b12d2d/xolofuserumebulo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/70475492729.pdfIn PDF document text
    • http://www.polni.si/Images/files/501514884.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/35676453842.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcdd093826---lepijumusigabesevezoguw.pdfIn PDF document text
    • https://majubesar.org/contents//files/67692430050.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/80889833991.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 19044 bytes
SHA-256: 0875e6a23a941b46b181c52b8936b9a5be866cb7fe166801a381554dc6debbe8
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 11324 bytes
SHA-256: aa203fbadbedf669c2cad397615fb571c706486ab5f99ab8569f27e78354074e

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