Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86e7be9a8db3721…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 15:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eef5f6f89b8a2c7c74ce2779f2620079 SHA-1: c401755940c5a2864b7a2fa8d82ad8e5e300e9ae SHA-256: a86e7be9a8db37212ab4b8dbbb1ef81caaf10150638217449b5ca3ad6cea26c0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, likely to obscure the true destination or spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=how+to+restore+reset+android+phone PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee274da3cd---59542022794.pdfPDF link annotation
    • http://bukhatirhomes.com/userfiles/file/nipofavavupedol.pdfIn PDF document text
    • http://unite-chem.com/upload/files/dubofuwumevavisemaval.pdfIn PDF document text
    • http://cobmedia.hu/include/fozenuviwegupinebalok.pdfIn PDF document text
    • http://synhbio.com/upload/files/ximiwaj.pdfIn PDF document text
    • http://scro.ru/pic/file/degonidunavepilewovoti.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/9232830976.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/29468158689.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/bamese.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/pezel.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/89131111450.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/40020441481.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/35621122000.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/21393801964.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/bojukewaxasitizonomirutip.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/lagotavuduxetifuzaziz.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/watakezum.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161440fac65d44---85109963488.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/gogalojavopuxixekinujuw.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5faeeeeeba4ec240d0ed23db9c5515c0/95313710715.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0321e8fdf---xamaruvemulokupuj.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/rituz.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/99136010325.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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10520 bytes
SHA-256: c24e43b6ba6fc8787a1808cb1ee0b6404e36df0230c9ad38e79e4faeb1d25c90
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 17832 bytes
SHA-256: 5566de35159eb99545931ee8a02a626777bd1fcd7af1b57971b5812e533966e1