Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9d3e0b56a3ce7b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 10:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f8d6275cb4f66dfb75f49bfd10cd832d SHA-1: a11cfa1175bad4076ee433dc202617f0fea2cc7d SHA-256: 8a9d3e0b56a3ce7bb999cfd56b8bfe9b99f5d345b6100893df98bb774261cd2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing lures or second-stage malware. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=unturned+placard+id PDF link annotation
    • http://orsini-blasioli.it/userfiles/files/23112664307.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210905160857.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135275e29ccd---45587082264.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/defixefegas.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/ludafowimebuv.pdfIn PDF document text
    • https://gencatakan.com/upload/file/pufadodivafokonajezagezi.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/fezebewezedujoker.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/netumiv.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db42292b1f---97445116052.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/bidajugomirela.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/xakenekiwufemexegusixek.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fozusobeli.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210916100929.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/samogegumumikukizuxosuk.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wobijadademozipozofodor.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/44787512725.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6247c23f---98431434253.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/62925886493.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/galodojop.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/4920778755.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/32531584296.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/85787776825.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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 17996 bytes
SHA-256: 7cb57fef1151b9eca69707751fb2f810e996c49a43dbf0817557f50778fcdfb5
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 10328 bytes
SHA-256: 637a364bde1c8e0ab41f1428e35dc57222577139a34a0ebb878cc7d60b682e12