Malicious PDF — malware analysis report

Static analysis result for SHA-256 0129d20c939273a6…

MALICIOUS

PDF

86.5 KB Created: 2021-07-14 04:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba77894db8e857aac22fa0d5814109c8 SHA-1: 54784b6f7d0a689de822c49a7c1f27ddee7557f3 SHA-256: 0129d20c939273a6d2ecb69ec60d53fb79d6f8b0e6f85f5e412684b4cfe1a5b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document functions as a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://philabc.ru/uplcv?utm_term=rules+for+3rd+person+in+simple+present PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516152550592542.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ccea272c3---52868224517.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3o7tso92q3e3tmcfifduojnuh1/42619631349.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7v140r61d2797ga3nqs8a2d60r/20087169379.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af844050112---fuwut.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/witowubodirejoteza.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b45fd54b2b1ad316ed977629a48135a6/24235942771.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160853fff46b1f---52708725964.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48151c15ba---rejoziwojizowojasikewosix.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39715866bf---22646401113.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/baduniketu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/db9470d7703ba070665bfb643ea6da4f/92414945155.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/28830562614.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/17b015ed604202a2d36e5b0d5743b780/gukibadinasobekiginodemek.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9c9fcd32da03a3793ad33f944bc2e627/kemunizovoxizove.pdfIn PDF document text
    • http://4bx.pl/public/file/25341652990.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gv5ic3b6f1lvngg21rvcm5p1u1/21538624263.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/20d5f1c3fd07f373c60fabde6baf4b8e/zutitudagetedepav.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084477ff29f3---39261528765.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a914149c5---13015287458.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32dc20b318---fonodidetukaxojamigevuw.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/migaxunanotijelilawo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cdfee7984---71175882435.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d649b5f1ace---zitojatibadovafo.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/wanedo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/nkohmaq445lls99uieibpokmm4/56891947024.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0c49ff38---notezalasugusopom.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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 18408 bytes
SHA-256: 863978cfdfd0be6ca8dec15ae3a508de38e7e200546e6f3c18885594b1335666
font_01_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 10812 bytes
SHA-256: 4a53e0d0f230eceebd26f311ac69b0058127c8a98d3c543c8e47109b2c92b3d2
font_02_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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