Malicious PDF — malware analysis report

Static analysis result for SHA-256 181593f837c9449e…

MALICIOUS

PDF

84.9 KB Created: 2021-07-07 02:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7e621e8d659835b6038eaf9c5e4a37bf SHA-1: 5422ae49c61b1a818231a8690e0c94c879cd9b1b SHA-256: 181593f837c9449e324a8f21becf05715cc7df134350a9d15b8b43d9ca039116
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and a fake invoice lure. The PDF contains numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting it is used for phishing or distributing further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://visit-pune.com/userfiles/file/58326382834.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bb6b75b0---82407163438.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160826452ae6f9---kegakexomupijulinewonune.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/89763307906.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/12238010807.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/662b58b6212fdd13546ce13de12e0b6e/82939247386.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tbb8u032u8qs7afuvqm3b193bs/jorekaz.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/t2k1bg4pds8i13s7s6gckg4s47/90062311763.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/jolabuzenuso.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/564q05ulbvdhg2enijfdi7f9ui/46834032611.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928b6285b99---ledijigizozudasodojufokap.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lhiejjv71d47s37fsqc5o29p15/69064390660.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc3a4ba38---wawewa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dsgqbnf4dg28bq7srpckn7j8i0/jiwepubixinogibaxi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/04hdhrjct0mv16ptptgrj474r1/771378733.pdfIn PDF document text
    • https://digireg.pl/upload/38295324918.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/kozusupe.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079112b57be0---38078203323.pdfIn PDF document text
    • http://accronline.com/userfiles/file/ziwasisezojorexababa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087135da72d9---88479392913.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c27a6a5c5---pigen.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3c1103f90619efcf6185ff25ea63e260/gesudemomitizidabakupokog.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f990872fe2e23abb9aa5f1e07cf90eca/bibenizafisarudupuko.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071957fdeb96---sukafibemopef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cash+basis+and+accrual+basis+of+accounting+differencePDF 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

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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 16656 bytes
SHA-256: eb64403a7c9bf16e33edd12771e7a784cfe57f29e941b37ea21a0f6548df76c4
font_02_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 11024 bytes
SHA-256: 6f6cea5a91f9173945c0d17db63ae67ab21ec6e00cfd99e5fbbc39a665917753

Open this report in the interactive analyzer, or submit your own file for analysis.