Malicious PDF — malware analysis report

Static analysis result for SHA-256 932829c507fbe588…

MALICIOUS

PDF

87.9 KB Created: 2021-07-14 07:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c96930a4dd52f5bbf53fceaaec99054 SHA-1: e270c27de586037023ae7eecd416a2e62029ed78 SHA-256: 932829c507fbe588854f4c9b70368cbe8a46ee050b447a84a5a10dfa2c5d1ff0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs suggest the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=math+riddles+puzzles+and+brain+teasers PDF link annotation
    • http://myphamlulanjina.com/upload/files/94481957056.pdfIn PDF document text
    • http://aven.su/userfiles/file/bedosamujikiwon.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce5d828861---zolovegewerajeloxuzobujar.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/4286355300.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f7505fd8a4145d9eaa0c0c79136342e4/40367128851.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/fekapusubobo.pdfIn PDF document text
    • http://citra.cl/userfiles/file/428598404.pdfIn PDF document text
    • https://fallsplat.se/file/kufavixowaboxifitu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31fa8b775b---1679223453.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbb9aa29ee---69150775743.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608424fc081f0---fisux.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d3d84f0a3f1bc31d8234723f3430b659/36023556458.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/3588314384.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///likafuvezofidekibokome.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d766eba863d---tudijusima.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jilosedegax.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/eef73286d79c620d6ddcf3f74e119d95/48398080086.pdfIn PDF document text
    • http://belst.by/upload/file/kamekejogofaxadivovoxi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/bcb68831c69c85f572a5391f59140f2d/rozixirija.pdfIn PDF document text
    • https://angkagenap.com/contents//files/57868347044.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081346809254---33741209957.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/55778418456.pdfIn PDF document text
    • https://jambukuning.com/contents//files/98971849201.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_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 17232 bytes
SHA-256: 29125021db3d30030cab723e371e807008b249730bdea246eb9a64e3230cead9
font_01_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 10660 bytes
SHA-256: a89dc0b4783af8e093f0e63dd1ff3f87ea1047482eac8f66d85f7a446b28f1a1

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