Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa78bea6acfe5f3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 22:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0f10e1086a2e7d6031f1e3fc3e97396 SHA-1: d5c8a12bfe56233db5d0396aa58ba51c32fc24b2 SHA-256: efa78bea6acfe5f3b60b07aa3a0719224c54dd77a358cb80c2633ae163901039
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics further supports this, as these are often used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://koppeika.ru/userfiles/file/mezatadejasoj.pdf In PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/jofigakesigas.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/8695299743.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/mojedawezovoradoka.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/dirs3dfs5qjoohjmm8ifbq1rr3/31272377106.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/derugeguzifudodumupog.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b124ec8c3b2---66865610198.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/milemekixudarigi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f5edcc250---22980372683.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c3aaba85---37241654469.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627168260.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/moxawijowekafufibemirazam.pdfIn PDF document text
    • https://actor-conseil.com/files/file/gobagaruwelu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf37c73b2---remekobar.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a25cab6dd03---mapukuta.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/49567349810.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/99350516416.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/ludukumalojupefetepinujo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a532d8048---96961401432.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/51891771343.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160988815856f3---56193803715.pdfIn PDF document text
    • http://esistore.be/userfiles/file/dibodafutemowudexexotageb.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/8918683879.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/22327435101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=recipe+for+scones+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_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 10352 bytes
SHA-256: 6f311d56b368d6a2e6c1b785a5da253745f0772b9525a80a040070afec8ae463
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16412 bytes
SHA-256: 240aa22b7c3fa7b6c3b3eac1e28dd0b80d9e578e4af2720668f0e97710407ccb