Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b8328d2fed6a26…

MALICIOUS

PDF

84.4 KB Created: 2021-06-30 23:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 678465609d67d33fa59fe4d9c1ec0f44 SHA-1: cf5c5efbff24e44a35a05e77098df1cb24a4ab00 SHA-256: 93b8328d2fed6a26eafd5020e33db0b49aaf3856db2e9f9a79bebb66bb8f840d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ampletrekking.com/userfiles/file/nonumatapadefiduz.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/50675547626.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dodbcmhnbelrlio9m7o5vt62t1/kajamuxizomonuzafaba.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/35603754086.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312b8ebc7c---terapolavonejir.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/fuxuzadu.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/filibibironerolotavid.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/wakadaxemate.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6811b29747127743f19571b49d265169/81730114571.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/3434141031.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/799719b02de0b62b30288c3ee076bead/73716921477.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e5163853---52072792266.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/82158901090.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cmhhiosvd6l74f4rf35lclt653/rekuwotuwalosojabenidud.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c33f48dc21fe36f12ed1adb85e29620d/suragikoxem.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e5ehluurrkvi7lpdqtpi7jj7fc/bamewarogufifarejup.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/dulan.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7llrsq63ios345sc5v8vgkpnt7/dakubukizi.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/46479776032.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5ba3c8d6---sawowudanadunagekafimapuv.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4393beb95f---51488901602.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/pilulujobajufonatixug.pdfIn PDF document text
    • http://cy2hand.com/userfiles/20582086620.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/2002332534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+illusion+of+life+disney+animation+pdf+free+downloadPDF 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_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 17232 bytes
SHA-256: ac002ca97784327363275601c5a27d997b62cbe7ed5ea8e0753d8b4f849d7f7c
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 11028 bytes
SHA-256: 35b98ffe21431a6110673caf5b3d7ac183c62adc40b796ed704332edc6ea4f96

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