Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b287a0377f08e4…

MALICIOUS

PDF

104.3 KB Created: 2021-06-25 22:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 434eb78d8dbec29a8d2d78b325b4a98b SHA-1: 939c06df8c175b1ccaae7cfc4f6321d4c7e420f8 SHA-256: f0b287a0377f08e4fa8a98f150f991008c3cf1a1e173f50025e52dc254ec1d91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160908d102e848---vedidonovoka.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/muzebefodedita.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b72430881---20924235437.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kadexulozubexagokupadam.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/7917513524.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fedozefuxos.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/20cd31bd05b20e850f7e52feafca20e1/xanibujexatimakijemidoj.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/18423670495.pdfIn PDF document text
    • http://mopron.ru/upload/files/mudawibalizabejorurakota.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4e56a2e8---bumagizomasexas.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/69724765690.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608138dcc5e18---jevotajipudefuf.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210623_064434.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/wakakep.pdfIn PDF document text
    • https://oliogalanis.com/file/35344207155.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/samuwu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2904bba77a---93792022197.pdfIn PDF document text
    • http://ipublicity.cz/data/file/sifuxevoxosanikin.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210523032603.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rra8garqakfsbk33411jqi60b5/17640711356.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44a37684db---zutapiweruguj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc6d83042b---sasovaxavopitifatuw.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a621934da0---vivas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mint+royale+singin+in+the+rainPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 16088 bytes
SHA-256: d06246de5fbca08a8e71b3266423534d5cc020e17a1f81eafc946de7058d617f
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 18288 bytes
SHA-256: 6858061eb5febb8e218f5b0e80705167fe9512cde3d94df7a3ac86fb0e81ca14
font_03_sfnt_off00015bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAE 9396 bytes
SHA-256: c01e7f081d2984dd6cd76cedd93ea4920f7b5839b12ab5dbad363aaf90531f38
font_04_sfnt_off00017b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B06 10492 bytes
SHA-256: 48ae373b1716368fda448d72103677602c16c89c5e160f1d70c20a79c062a1e1

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