Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac928d778b273d9…

MALICIOUS

PDF

80.8 KB Created: 2021-06-15 17:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70d31e72d20b0b43d5d74f4ab1a0d871 SHA-1: bbc3ad4d36a31345458df1239c915071c9662289 SHA-256: fac928d778b273d97f835ed91f35b0f247716bc49cc9ccf3c09704d91cbac68b
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The use of 'utm_term' parameters suggests an attempt to disguise the malicious links as legitimate tracking parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=the+kugelmass+episode+summary PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd6a640997---vadovefivodelafov.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160762624e9da2---37931554906.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/64816d2f9806d5c8aff741505a594dd2/xenote.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8c4445b8520e7432f9519471d722deec/42044121274.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/58425356561.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/onsmcoa3uecfb5lk3iobgk3brk/48083816181.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5f6a056e85db8b3c06d83badf0df150f/tazam.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/kufajugiwi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc37c127ec---86154439853.pdfIn PDF document text
    • https://emprenderem.cl/files/baxifunopitowo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/52468e8f33c40470c2a1c0e7a2e1cd06/sipuvi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5161b8d3---37990603415.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/fawavimivezeka.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ee04d646220de1893c489dc048db9143/39794562388.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa91a2e8aa---vutugufuwagelowagufesesu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f221dab803---3682709.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e797203746---51314691857.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0796d95a5d6f0f978626b15aac7ff16d/xonuronixalemipiwapofajiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 5488 bytes
SHA-256: 79af3b588eff93ac69978bdddadb7480b88f69943dbd8476e3320f23f502d3cc
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10920 bytes
SHA-256: 273ad0d42023cb883c166782faeafabfd2cfe5a446bc7c72be6af51c87330d04
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 16100 bytes
SHA-256: 2f34e2a47881d07bf5e0ddcec7fa78b88f5f828504524ebfdba63e029b22e37e

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