Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78a5d3cbe35534e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 22:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81b975a158654807eb5aff037c1f9a80 SHA-1: 5ac0d42cbd375fae88a8359d5d64a6425cac1665 SHA-256: f78a5d3cbe35534eaa57cf7b66b9849b6921fb880e483695c0074f63be909022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of external URI heuristics and link farm detection rules strongly suggests the document's purpose is to redirect users to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=swayam+courses+list+pdf+2018 PDF link annotation
    • http://alexlunacoach.com/img/editor/file/61114264746.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/buxotadejowo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vqosm19dqn8edk5jfphm4p2l7g/kivimefepivatawoxiwala.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/60721388865.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9941339549.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/47128169460.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/wimorifuzufavituko.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607faebe30368---16214481550.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/fufotodipipidi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770c45bac57---rizojimixuvo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bd60d94fb78661a1c494825ce2bc0553/58907948041.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/kirivopesoselasuzosumedo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d94ce89fa0fc747c8da8c06b02b08c7c/65368793082.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/koxedazexolilogu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612383b636265---26049469195.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/djbh4v44tk66upma5kj1lksh80/zibifizusekam.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/dipame.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/lepafoxijupotudud.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061308094870554.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e7b19a7309ba76e311c586b57e9bc0f7/1114720508.pdfIn PDF document text
    • http://boxethai38.com/upload/file/lujedapofexa.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/vavatopufiwaw.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/49944466614.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/51044479870.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/62604139323.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ee53aba7---15508264877.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 11552 bytes
SHA-256: 32cfeab30572a6f45d347cf300a2ed48408493542b1041b8d7a641587e41e144
font_01_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 17792 bytes
SHA-256: 3f86c29e361736169719cedfb1fa72922a87ac98ec06534a9ce1984cc7b0c97a
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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