Malicious PDF — malware analysis report

Static analysis result for SHA-256 a978dfe8f885344a…

MALICIOUS

PDF

79.7 KB Created: 2021-08-20 04:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 587795c0063c7efc2189e873ad5fb74d SHA-1: 6fadf1a64c4ffeb14361cdcee1a68f608e288365 SHA-256: a978dfe8f885344a0c7f12cca082820d4946ee50494dbc504b3bfba85b3259c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to lure users into clicking these links, likely leading to phishing or malware download sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=dead+samurai+unblocked+66 PDF link annotation
    • http://martonelektro.hu/files/file/29337754307.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a187508543---mododamazimuvur.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16085d89d316e8---18709065162.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/fujezubijizukevuragaliw.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160875168e35db---33850897495.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/saturew.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa3b04e54---fidafudelijenow.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/vivupunurifam.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/39345618350.pdfIn PDF document text
    • http://www.heksan.com.pl/file/mogizoxapurunitigesejuves.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609993960d725---lakufavemiwixow.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d8rhhrjftfd9afjreo2ub0t0r3/vuzirilibevukipi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/evqgptiphpfirjddk6fgvsgdme/barutokonofawepuga.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d3ceeacb2f---janufobavog.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0be3daf313---7468528543.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4v3beu7eu5lk1ktdqg479q8h42/jububilez.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986f210a219---41683748362.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/87931277675.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/sagegobineromixumozesu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/23279534592.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2595e7185---16937725112.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/69618607140.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/85485697754.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/vogodovitidifanesikemujug.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/24787566012.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8ec8bf59984a5c581a22377689af4f02/30575143870.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/o8b3kmprmkm0c4c9t63mcd2rv3/zutexajufalozopopamipeba.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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16768 bytes
SHA-256: c25ad58515a9014d965a5ffdc4c6594a97259baeafdf120612bcab3903d26161
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 10936 bytes
SHA-256: 383a2e37a63bad2994e06b92472661f6ffba153737ec08183926216659b468fc

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