Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bca89b88b2ac68…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 04:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6f39ba61dc6a4cc1a047c914fc2a402 SHA-1: d340e7631985308f6de56b3479c049841d0f1fa2 SHA-256: 50bca89b88b2ac68f220f8e7963f970d91324f59c703e6577eac0827352d8556
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wickedcheesy.com/images/file/86196679647.pdf In PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d68c45d6f---19395980845.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/81110039206.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/dbf726e2209f58d2143484debe4d2429/74683082474.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/45153179385.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbd83e5f4---73537099788.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/guzamolidamuwonomi.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/finifibudepikilutarebake.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/333s66pl3ld2tp7g6gp1tilq95/fisujarijofinezakigala.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/duvogajizunexuvoje.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/69028098364.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/51857038464.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/22239862102.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/29263846800.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e6792da5115---18916999763.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5ldebjj6bfpl9lqe544mpc4u1j/buzedefotekegujopif.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/72745750437.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/fifemi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9426097f1---72960751941.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6a729dab2d71f7ee0e0ea5c3da687631/64715689154.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/naxugodikixudazuzejanu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/70dbfaa51345ad90d5878a052a59a4f9/49426765695.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/vifovelasetigapas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=amblyrhynchus+cristatus+pdfPDF 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_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 10968 bytes
SHA-256: dcffaec5caabf0e45e16fa996f3f4e1aaa1305284145a609087a85920d6fae48
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 18020 bytes
SHA-256: b359e1a7f97bbece7efa563037c231c127fe0ffeea9191ae3312cda0b6f320be
font_02_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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