Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf1d066dab32c44…

MALICIOUS

PDF

101.9 KB Created: 2021-07-06 23:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c14d8a9e9aa293e4ebd85bf671038e55 SHA-1: eab4888be0aa788b847d6a8312a428e085a685a4 SHA-256: ebf1d066dab32c4457bb64733ccb04cdeafb5577ed1ae586fda31e240b220839
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other domains, likely to distribute further malware or phish for credentials. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d2fea3a32---59727572329.pdf In PDF document text
    • http://naviway.su/upload/files/72653111527.pdfIn PDF document text
    • http://etre-belle.su/images/file/bafupuwebobevelonipufole.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/63735678175.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46b29c2d70def479bbd02951841f4932/vuwoloma.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dacgpuqc55o0i6berlf0r5vcro/75596937046.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/73750838861.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fea1a0e27930c123207567a57aea1fb7/62259511158.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160769d8226424---60894713571.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/80990374034.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/13924710418.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/a3c88e0a137604300a7e673c35a0266e/2134647890.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/664cd39937c944ee2e5fc45eb420eab2/41792087140.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/32ae1fcb43fcd2f0aa0b9e9a853aabf0/gepizidajetutumopojifaf.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/81087335419.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210701154704.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vurojetamejekenelegadozu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/76106514326.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/0c3go1t0l78403d4eu7qd0sp3r/wobawedojuf.pdfIn PDF document text
    • http://klpa.net/userData/board/file/93711756101.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c6784ca7---13345310235.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa299690721---9767684814.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb2399f8c---vuderorulofunupixupove.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b12075f3dcbf8ac846674435b69f0fbb/bukolon.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9de0a0511---66924501837.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/64625355276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=renown+meaning+in+englishPDF 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
stream_006_off000161e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x161E0 21736 bytes
SHA-256: 0e7028596626a5ae5af0dd6a043d10c4de6eef5fc60a9735ad4d24bfce90bca1
font_00_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 26124 bytes
SHA-256: b6b67416b84807c421a2a012d53024ba1d84b37b3800f130f26a68a779334c9e
font_01_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 3844 bytes
SHA-256: f730f36fa8461e503a71ca4a99bf22a93db080f4caff48a6686e626d3966679c
font_02_sfnt_off0001321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A34 10488 bytes
SHA-256: 7f7a46eeb91ba484eaecc82031b9f5c0738464396e06822af425340d4d4b5759

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