Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61b7d399e719492…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 12:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cea0d684820b92d1314cca824bd82566 SHA-1: 377c7082a06448e2637b82596ebf485c2df68c2a SHA-256: a61b7d399e71949296d0e3362d1b7b8e876621d1d9a7aa32276f811ef7323f7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute potentially unwanted software or lead users to malicious sites. The URLs indicate a phishing or social engineering lure, likely related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=vidmate+full+hd+movie+download+app PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/abf2da932c22ea37bc895b1941554d89/masoxoragelofokixewetas.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131914b3c0bb---7688445070.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/basabobusavoz.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/25254181500.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/bujivexizezosifudojosem.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/podukasa.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/67979959398.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/87394076347.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/87246560847.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/29582611868.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/sorurixumimoweriwi.pdfIn PDF document text
    • http://momsystem.ru/public/file/62492449328.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/96237279980.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/pimugivukogafewatipufavag.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/lexevanebebaselupe.pdfIn PDF document text
    • https://dptech.vn/uploads/files/xidovefaxidefifusebole.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/vesuvinumub.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/53983981725.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f601593821---38379737308.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c2abebea24fb2092ac9e9af62b80a618/pakixanufilixer.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/83550961454.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/78417734956.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_01_sfnt_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 10716 bytes
SHA-256: 4492b7c657bd4448acefc5900338d0f357e36b03f78f4612a752f3887011836f
font_03_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 15776 bytes
SHA-256: 26cc7858c74313c4b2717cf4e642fc00fe60f3cc3d382c81d2e7eb3f1184cb9e

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