Malicious PDF — malware analysis report

Static analysis result for SHA-256 8305cafdd0c9ae87…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 01:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd9d85c53388e05d070bb214cd53f74c SHA-1: 20ffde3d457913140dbd541e8b3c30e8a80e7d23 SHA-256: 8305cafdd0c9ae8787ca1d602ab67d9c7357bbb3d6f6ce69cdfd98d96b0c8d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as being on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=free+play+app+store PDF link annotation
    • http://midospa.com/upload/files/34760679091.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/32367500721.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/tuvisirutisega.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/97138518031.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137eadd790e5---78328926077.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/49522896189.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/32284934828.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/98627244747.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61034052662.pdfIn PDF document text
    • http://ttc-investco.com/img/files/56448334694.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mosakifemo.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/66486754330.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/46557783343.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/1707990510.pdfIn PDF document text
    • https://halkum.rs/files/83117338645.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rizenewipidoge.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/gizezedemejeduwazolugu.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/werijiwap.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2012ee53644f068ba2061004d91cd5f6/vumudur.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/98242451933.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/ripepuwujewawob.pdfIn PDF document text
    • http://aprt1day.ru/file/fejufaxaz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/87457a746f9e558add6f9eb0d598929c/14385843843.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 18092 bytes
SHA-256: 85d3410d721d4956cd10e74594e2b5e24724c4ca9af2aefd392a7d8199883d0d
font_01_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 10140 bytes
SHA-256: 21b1eaa9c08cb2d3aa52aede1a3ec432a4de12645ab2c295bab471d04c7b0462