Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00489ecc49b32d0…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 10:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7260e8999b7412047ee11f748128565 SHA-1: f724e33b5c7d5456929b089e4467210a7e179b24 SHA-256: c00489ecc49b32d0c4b99a9cd92da9162fdd61e88f68b5cd35317783219f878d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=mycotoxins+treatment+in+cattle PDF link annotation
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a167dd6b1---vojavit.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/5092553486.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/8004515036.pdfIn PDF document text
    • http://masonhn.com/d/files/56109713145.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/jikugib.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/72178491056.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bef93e3ae2a---1545593734.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/66875183344.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/34989863211.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/26452924463.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/damajizifabosidugoxoxo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vexutaluk.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/58585824519.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/sedipuzolasopumenev.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b9bd25c6e---55441704051.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jn1r2pebo6ivm7ic68qbs2u6bp/nuvonipuz.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/xonamuvite.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ue6i6bgqsva28jfhac2b7pv2o3/vewitasonosivedox.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/43206674307.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/7663382104.pdfIn PDF document text
    • http://askaudit.ru/price/turaxavujikenesevafelor.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/54367178316.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/wovelutaronimodut.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/48c0175511bd8eaada7c52defb284c27/76677299710.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/nuwoxuxe.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_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 10600 bytes
SHA-256: 4a822f4465894f316764fafac8fe5b5ecb8868210acd794b7b2bd47693c86ec3
font_01_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 17904 bytes
SHA-256: 81f006931a8ff1e19e6c0d2e422881b119e3c0fa21bd6ae9879b6aa7cb883509
font_02_sfnt_off00013c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1