Malicious PDF — malware analysis report

Static analysis result for SHA-256 d043c4526a24302e…

MALICIOUS

PDF

108.6 KB Created: 2021-08-18 03:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae453cd7ec5fc1f803486527f9ec47f0 SHA-1: c0a6b2a0ffd3c48f37f4e007bdb75be8319d4f79 SHA-256: d043c4526a24302e9ebb03819a30f029d85e675a156543ed1ca1ea68b83f6bc2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier also strongly indicated maliciousness, suggesting the PDF is designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=common+themes+in+caribbean+literature+pdf PDF link annotation
    • https://espiber.cl/images/uploadedimages/file/bemelurazake.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/gexob.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/gadugubijibalawalos.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/weroxililu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d545ddba90---kobew.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/aba0af36a362e310768f313ec3efff04/gozinorifununinavibazif.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc340c7937---52733158525.pdfIn PDF document text
    • http://zuche0551.com/upload/file/31576419239.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vsfitaqejnfcapk3cvmt19c6rj/kiweboteb.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eaf00154ba63392c0ea03d1883003290/pitenadakadonikarogu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/buvirorexomoladuvi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/nulaligigu.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dubadoleledupunubixakon.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/27965180344.pdfIn PDF document text
    • http://zatacorp.com/upload/files/tifaz.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/gusozizokimipovidofew.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/15684924828.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/75881232018.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021080803141170554.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/84310321147.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a530971555d17f975870aa431ea272c0/fotugirep.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7484853a3237dfa8d9251cb4c240081e/jedewajabe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ef78d1d659d1dda9e13ef09116bdbeda/18417306904.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_off000142ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B11 17452 bytes
SHA-256: 4a1eb3527d482c5c34e822f2bfa223e59081120b3920691152441e303a5453a5
font_02_sfnt_off0001883f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1883F 11156 bytes
SHA-256: 365b89ae6bf334cb1d262b37b5ac99e5a7ee0fb92a227da2485826ba9ceca73a

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