Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80f1b31cc3a84ff…

MALICIOUS

PDF

85.4 KB Created: 2021-06-13 12:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a848bba6cbd23fa7b964d82a5752fe44 SHA-1: 15d4b333e506f5714c9877e8acf65aed4e40cf04 SHA-256: a80f1b31cc3a84ff71a063103633247b02749a6c5d9343e8965450e7a7aad4de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm designed for SEO poisoning or phishing. The embedded JavaScript likely facilitates redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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. (matched inside decoded stream)
  • 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://chcial.ru/uplcv?utm_term=bhagavad+gita+telugu+book+pdf PDF link annotation
    • http://alnoorcity.com/userfiles/file/mejosobefidoki.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc5eee2c3---22084084671.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/guwasuroloketevor.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5i1494s8p3jht1sosg8r1adja7/zorixubamemaxomedoparaka.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/patogizipasuni.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c4d0da8e8e968912754464ce8e795d09/ziwalisumiloxu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/xinatu.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/43302350000.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/82640194762.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8eef7290dab5943de8cb6a554037655e/garanasokokamodexino.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/39542939253.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/fe508206492ad4ba589601c502291cbd/xanuvobone.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1012cd5d763a9586b76014ba182ef985/81842367245.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7a4cd1db3---6078214541.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b3e4cb6fc---14462628892.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rv48c7ro1arv1l22ii7hdkksce/70532908037.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/64b362740ac5aa578266706445d3a532/12791413974.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607347e09c6af---58820329986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 5344 bytes
SHA-256: 6ae46cc74bd6dbf4a18f47a0bbc59f36854745e90d5f3ca54b2fe70786c6984b
font_01_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 14980 bytes
SHA-256: 54fb8645a09917512e5faff804da96b3fdd0253937b57706e484b8af172b7440
font_02_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 10376 bytes
SHA-256: c37394bafd12f6d2f9600917ac05389fd22197e670cd6fa3af9b2dff76c4a009
font_03_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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