Malicious PDF — malware analysis report

Static analysis result for SHA-256 518fa6d65e15fd51…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 20:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6db194e1914d60d3f3b7187a9cc1dad2 SHA-1: b890825038124896abf7b363c81112ba6853eb60 SHA-256: 518fa6d65e15fd510707e99096b0ad05f02a6fc372566260e378801704b4bc37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress sites. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=user+manual+obd2+eobd+scanner+en+espa%C3%B1ol PDF link annotation
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7721879d5---pedaf.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/79183776822.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/datijaberipimumo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e96a9a772d0---bewujamu.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/gasumoxafi.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/33546364266.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/69425002831.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/mojovobipoxuweb.pdfIn PDF document text
    • http://dentali.cz/files/files/27676508595.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/sugugesijaruvapum.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b0734320747---tijudokinadopovezeb.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/7210330561.pdfIn PDF document text
    • https://akvaguru.hu/user/file/botodu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/66aa4b924d72fd8621a7c368b784f493/sawobatezages.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/mirabokenuvopoj.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ba9fbe16d5354d7da022ae2fcfaf4d8c/23982747568.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2df5b2b38a1ad70b04d93093322f91d0/66904829978.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b271473785---33654468075.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c3f0f85e---82135961596.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/14466844738.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/73919958286.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79575f7b6---wodukoniwudurodatefizeb.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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 19092 bytes
SHA-256: ed9be803aedf23984aa9690cafb1f4afe031d9b7694a1ed4a9d426b201b5ae86
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 11060 bytes
SHA-256: 9ef611b32f13065eaf5f478b68d1c1968d03948254f610a4856376da38b54c2b

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