Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6aa1326dea52c2…

MALICIOUS

PDF

120.0 KB Created: 2021-07-07 16:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3f9a2af970904ecd2d36f15c197a84f SHA-1: 18458e75e21b670754cc445ecfb4fa6c6bb27946 SHA-256: 0f6aa1326dea52c2aad836434b14611f08ff3a8a0ea50638dcc5c39577df3cfd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://infrive.ru/uplcv?utm_term=place+value+multiplication+strategy PDF link annotation
    • http://krevue.cz/UserFiles/File/ponoriviwuxoluxav.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b58d2b20---kefebaminorop.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/nodogafisajerazugevapaxe.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/95500413676.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608540e975ecc---33818962924.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8081a4ebfc---82756062874.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9r1o416f3ta60asjtvlv3hvso9/nupavotoxerowamuzurezim.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c312ad1c1---93438735457.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/sonewujatozoze.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/86101410015.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f8c20996153a4ccbf7cd5d50a6732375/kisomizeboseradupatoguxik.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854bad31b11---zarawunudezizenupu.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/kezimupi.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/11934060537.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/77570220089.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/vadejomaxususenivababewi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b0d0b254e---54086258529.pdfIn PDF document text
    • https://inifd.london/uploads/file/merobodawabeda.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/mesigib.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/974c04f95d69376e8c7e0d71ae50565b/21842284316.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ebc30faf9---ramofazat.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210526021736_618757387.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da87334fee6---pijafidav.pdfIn PDF document text
    • 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_off000171eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171EB 17792 bytes
SHA-256: b193a09e5a1099e1aa24b485e5917a97d5f7405166d1387be06d448809cc1e27
font_01_sfnt_off0001a0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C3 10996 bytes
SHA-256: 3fa725748ca4291ff4b462591ddebb62c72da474bac83d59e5d9d27e352b4560

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