Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae9c9ea8492b8e…

MALICIOUS

PDF

107.3 KB Created: 2021-07-07 17:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0da58fc075f860e7bac142fe04cec41d SHA-1: 1f43415bc52202d6f7d17b63340f01663457d263 SHA-256: 87ae9c9ea8492b8e426b21c3f9e915c705ce8ad37ce17e17e1f21fa7a7a65b4a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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://allytemp.ru/uplcv?utm_term=empathy+meaning+in+farsi PDF link annotation
    • https://angelsstaff.com/uploads/file/75511016923.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/36147441834.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/doxulasoxan.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16094b40c2a4e3---6752616611.pdfIn PDF document text
    • https://appfacile.it/file/wexoge.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ee5204d2d---7795673010.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160767036278d3---ruwer.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/sijusodejiju.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/sezaju.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4881d4bd---53762709968.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/38660212534.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/jazelenudadopej.pdfIn PDF document text
    • http://capital96.com/userfiles/file/54906972254.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/30037856534.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5af391877c91e2cfbc6e4167121a9fa3/24167557036.pdfIn PDF document text
    • http://df-foundry.net/d/files/titomeropedupez.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779dee9bdf5---wadewujabevejoxiwujeran.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lozaxisumurigirovidunenum.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d6c815c5d7223fbfcba9af06361daba5/58841262743.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8furjj4o0d3e87h8rn02p8gab7/lunuxilexededamikazejiv.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/33073993074.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/aa3ee4uehpti8s7cnjiqukpgk1/doweluzufelapo.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/r5oci7ulhoaenjveegrgu32qmc/depimerebatujojavegeza.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/muveranopazujog.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kalevuxawasodopinejidep.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/db483462745b46e83d5712be6d8ba1e2/99532102860.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016b26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16B26 28296 bytes
SHA-256: 7a6a28250c6429593f0add3ec4ff0654afd4a419c1207a96bedb4fd49049cc21
font_00_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 10736 bytes
SHA-256: 20baeb349e8ffe0a853f59f58ade64e3beacfd7b42e4e7854f0d986379c8def0
font_03_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 22688 bytes
SHA-256: 048b0e9d386ceebb92156f275a38660cdbf18138930bdac510d496ca9488fe83

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