Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9806d594d0fe2e0…

MALICIOUS

PDF

73.5 KB Created: 2021-08-28 03:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ab9ae704859d59cc597654669c8b3a2 SHA-1: 0cf1de20a5651b44585f206e5f21301eb5c18b2e SHA-256: a9806d594d0fe2e03702160e150c62faecc220917183471ed1713005ea236258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, indicating a likely attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=molarity+sample+problems PDF link annotation
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/haucr95la0mm8n6mfv5bon65k5/47058100992.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/51902189107.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/nabemidinawak.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160962bbfc113f---safamipiwelopem.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24605187087.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/88567429967.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/13300425875.pdfIn PDF document text
    • https://parkettworld.com/upload/files/27032156503.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tdqq21ijapcrnhcfaafn88hb3h/nosesisu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/461fdde8a4b473a922f701149fe507f3/zerofenugomozume.pdfIn PDF document text
    • https://cartolmania.it/file/83410219364.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/mekedurutulolufebuwujez.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/wewaxuzewibi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f959c291541---nuzejabifubevewofiferi.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/napubazurazekegubijesako.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/26810166143.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/63384045597.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/rasukogixenexujos.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0797409e---2773894733.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ae792b4c54c8dc666fa238aec7d6d797/96199795072.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wotesukiwabilinotepoxoxek.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a776921945---30462133599.pdfIn PDF document text
    • https://2acontractor.it/images/file/63984467840.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/romiderekejibarevuxawef.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/fizuxujusikenebakowef.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_off0000c039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC039 15672 bytes
SHA-256: 8cf9e146c88126a3d249a9c5a7d39be1367a80477adc4aa2c2929fa7343d5ad2
font_01_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 10556 bytes
SHA-256: b1f3f550973ac2572042248a3f03ab16aebe3a6fa40637e25be0b93da548f62c
font_02_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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