Malicious PDF — malware analysis report

Static analysis result for SHA-256 171c2c363c809875…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 00:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3cc59214c99dc80a85cd784f082e857f SHA-1: f3a723fd60a4bc7a055ee4e1bbb0b45aba97a28e SHA-256: 171c2c363c80987510cba6c78b7de6a42b0df02206d68e7e8210e2491e695255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=candlestick+trading+strategy+pdf PDF link annotation
    • http://degrossier.nl/uploads/file/bedunewetaxoseriledotukem.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/xewixona.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/24703845945.pdfIn PDF document text
    • http://tano-cable.com/d/files/63562501074.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981fba5073---vifimunexezowobebimaw.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/46526833534.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qaom3lemqfl96gkda3mh7r7j4c/devovovifewumewex.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/noxabirof.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190a7de2170---79401628869.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/de0715e1ed569aa5eea057fcbd209106/wagapewanozimerid.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/tuzobawime.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/xopow.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/87795727650.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/dukulojufabonokabivar.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/58867341160.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kogidedopet.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/judixibinovasajo.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/95717779765.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/90lcdornbmgf7ft5djop9eqdr1/paleboratoxawakogesovu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/1176226993.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l3tthhlnsgahgocgqa3n9ahad7/rofunonapujuwexabofab.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/35108861422.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kopugakedojimudilejobaf.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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 17096 bytes
SHA-256: e808d78d35bde7873be4a7f359fbfa42daf3a8fe3ebb4fae45514f82bbd94217
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 10912 bytes
SHA-256: 27b972bc05b072ab7a0ebac1fa06064ec00696e150132d17d30f9fda66759f12

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