Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69cbb07fc4b1329…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 04:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8bf5e5d09d29d83ead02f1258f885e92 SHA-1: 5fc5afd72e429779fad166675241c11ea62af0b0 SHA-256: f69cbb07fc4b132927a5e2a1344c8668afbb2abf882544a9bf99d7f874c2da27
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to download other PDFs from compromised WordPress sites. These linked PDFs are likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd849aee8---95944814304.pdf In PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/92824944180.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83526b1d3---33827281528.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f3c3b87ec---borirogotuvonawul.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d62d86ee0513b0203957a0602db238b9/87989610589.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873de018424---89039434862.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54a8f4eed9893347f0ad5c29f2ec4078/wuvoziwokojelozolasa.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/93863655433.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/kenagepedufufu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f5b10e89f---kunepi.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/87730729047.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca5da7ce6---94620775509.pdfIn PDF document text
    • https://pmms-online.com/assets/file/38330710614.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6e0d152b1d9d2ebf0e42884c97cd75ee/29175560158.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fa1a0a09---vefetofovo.pdfIn PDF document text
    • http://sns.hu/_user/file/kasab.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/1641276303.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160712cc9667b9---64886247461.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/fa42a3e9be217fc1c20268c97cf67a08/90158556204.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/df2f01ac2454754bc1ec7e0ca32c378c/goziboxaridanosofivop.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/84000614896.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08870e61701a544d3f130384b13a89c7/nokudore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=finding+the+central+ideaPDF 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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 16948 bytes
SHA-256: 393c4da0b4ecd61986d590d66336d3aaef49840400c74efc1fb54a72c4023f5f
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 10340 bytes
SHA-256: f1b5c0303710be4ab0afe37cd7672fda6bb4230f18b40d3d2087aa8655ad077f
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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