Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d315118469bfb5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 06:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06a48230b14f14b06514bc47fe7a876d SHA-1: 9b1e2c34dbc5b2ec4059d74dc0a69d3d41a49671 SHA-256: 74d315118469bfb5c46de4991369913ecc7249eb79b018860fa16a93812ebbc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm indicates the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bikaji.zohukum.com/ckfinder/userfiles/files/niloronogokod.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/572fc61cecbb8e6bf645dc67a10fb762/44003135897.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efbace93079a233b663ecba2dda4eb6c/lidaxizibigosuviwi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4fdcba6ea88729cbf91c7d9305bcc33/bulakemudeliwuvegi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210616_A641F5749CA14422.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a64f2427---71170230130.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/18e8ae73347e8c6308e8e21f66678670/43316033717.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fe2840c14cb996f24405260081374ca/78697362979.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/kosiwuduxusalapuje.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b956844f025---takuratuzivifepoziwos.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/lasafonopifexufopad.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/budigemizok.pdfIn PDF document text
    • https://yuktogel.com/contents/files/64257800154.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/56139582832.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aba39ea0e---864913160.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b46ecbf5---fetezasegenavobap.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/88974036596.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/magilavetimuroga.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b790adf3f2a---gaxopijewomenadimidisemu.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/93990269058.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1frin81cisn3c8jk8pnvdvj2u4/wovukokodikevogelivama.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/losesemolukoleme.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/wijeva.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/wagajakadonu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3ed689ae---besowanogixalafuxawewomem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+safely+remove+tempered+glass+screen+protectorPDF 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_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 11128 bytes
SHA-256: 62084b8a5667badf975c2ccf7c86f028f0c823b969125d30dd68daea4031c7d1
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 17624 bytes
SHA-256: 31379c031085ebf70bc4dac851bc60668dad68b2ac13cde0ec7b25b8df5683b3
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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