Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19a53807b8284f9…

MALICIOUS

PDF

89.8 KB Created: 2021-07-21 04:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 380e304c57a5404c19af4339e4ddc1fc SHA-1: 1be57fe42c9dc70e0c4d131d9843a296c92f38cb SHA-256: a19a53807b8284f9af4018cd39a82259a0486f5f3586c822d270f87fb7cfec4d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ib94hfhbuskd01o96ufbn9fnl5/kozozazaxewi.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/85a9c4d63dca7e30b065cf9889efa194/batexakudokaposaruvaz.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sizigegarovar.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0a1k7qt1hsn1ve54om81a9g671/xibomutevixunefinonu.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/futovitiwefojemifugo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c686ef51fa6---65950932363.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dm9jfrg4rf4pquc20lk1knuci9/bigugelumap.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/biponomesunazoriwoweve.pdfIn PDF document text
    • https://digireg.cn/upload/60199271799.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14cf1ec2e9---poxugimis.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/vupezepotupolatuwoda.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tizavonenil.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b19b9849503525c077780c99e7e5d465/14098709986.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083c55d86de3---zukabir.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/16163859470.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/80882058977.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/kidadi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e8d0c01d670ae9b8ac2e9d096be9aa7e/vuvixowujova.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2c62490f---37643218009.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/togawotinutufaxazibi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/ridexamepijokuxisalaliji.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/togonibipe.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/7d40c79cef185cb92e0081eb1875bd35/pujejikilemofo.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/11385952218.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/zorov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=blue+forget+me+not+flower+meaningPDF link annotation
    • 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_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 10628 bytes
SHA-256: 073bd72359c818490af73fadae7ba01aa40ab1c27bc866a43135ec89325f7847
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 23612 bytes
SHA-256: e080bfbc976c3be3702fc8d2160fffdedab92a082dab9926123ed14ff22f644f
font_02_sfnt_off000141cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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