Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a1c6a86d55b030…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 09:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 234b8a72ec6c2937844531245b7e276f SHA-1: a741b622560ed2cc712886faa3ca938fd374e042 SHA-256: b9a1c6a86d55b0308ddbb253740fa3daed4bc0f9efa68a8a6faae6bee780e7a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads or disposable domains, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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=gibson+assembly+cloning+manual PDF link annotation
    • https://xyoaa.org/sites/default/files/files/sonejaguxo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdd72e4ab---tisavimadajivumesonodabu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/39189495927.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/zaduwopijeradej.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/18733832368.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/lizojuwemetinew.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/55197185757.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pufopubirivodujadomuvati.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/67225553206.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205658d68e---11248257048.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/90962885245.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kazivedilupekelekabi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ad497aee3cb---pekusaxibalazubid.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/zitamu.pdfIn PDF document text
    • https://bloc-immo.com/images/vakuzabupitusa.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/tafipodaxokuv.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/virilovowa.pdfIn PDF document text
    • http://9jamail.com/userfiles/file/70629264108.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/fusarizewagajenines.pdfIn PDF document text
    • http://www.vignolaweb.it/ckfinder/userfiles/files/50598483563.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/55429774369.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/votomibemodus.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/gelalipololewetap.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/simipaz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633773070b---tazafavegejesikazot.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_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10768 bytes
SHA-256: afb7440d65580b2b00355537e4edf23bbe8bbc2ac675656c8f58acf75aea7bb2
font_02_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 19076 bytes
SHA-256: 89fc57f0b0fa9a68197be0718631dbbbf82ba6138d1ab7139f5d4658f342e812

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