Malicious PDF — malware analysis report

Static analysis result for SHA-256 71866c121696841e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 06:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d876b64788475cca887138923af8a25f SHA-1: a6616c382593fdf3abe9da20de71066e1d293cbf SHA-256: 71866c121696841e7837d51779b9b1f514d810e7ec4b6b59da1c87fc81331b32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=trainstation+2+ios+hack PDF link annotation
    • https://parvazyab.com/basefile/api203/files/sodarete.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/kebuniwufobi.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/26118037297.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/59014678931.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/tavunim.pdfIn PDF document text
    • https://petikdaun.com/contents/files/lebizetibibudexanaxu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d5d292fed240b4ec665274176e3de196/sejapug.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc66618117---getudezibemulu.pdfIn PDF document text
    • http://erpos.sk/data/files/dumemu.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/98739544391.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/luvasiwu.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/7586356132.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/54837573186.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/panafikowivaxese.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/gavokofuzu.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/79824969291.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/kizikugexuboreb.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/59552405578.pdfIn PDF document text
    • http://bamor.org/userfiles/file/larubedawupatutimikujo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1aec6837216e1c4de6a4d443e91e6edc/vakajeribasezag.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/32031135088.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/fuzexezex.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/retawok.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_off0000d01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01B 18432 bytes
SHA-256: 4158e4559a7fb8c587018a17ae487881d6b09ed1eb80dc729cd44288e01b2193
font_01_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 10324 bytes
SHA-256: a05cb6c82130fffb74b2b837781c0427573307a072ca3dfe2b91798e12ab8427

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