Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1312183ad2251b9…

MALICIOUS

PDF

90.9 KB Created: 2021-06-26 19:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1f63ddc799e7de2d5d1dfb965b77f2d9 SHA-1: ecf6e5cc3eb10cfc7da382ad4b19ff0951799c60 SHA-256: e1312183ad2251b930e5bca49f639c2e053f1ef377e5b330133dd949c46e1368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious or phishing content, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a443ab502b---nufaxiluwakiketifedaros.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/43e7ea309f9b97e5a43163beb11acc10/91366545149.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbde32deae9---dopoxidagutuxani.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/dobigipamelejopupero.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p6d86j9042sklmjl2jmvq9s6v3/fonofexuvetipepupifapi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/mivofinusaxomikogekekaji.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/36720199082.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bae765dcbb60bce1d9a1266a26754b77/witinubopevifov.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a324db9dd54---31431160728.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/19159383728.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ade6a3c11dfdb74c371dec22de7fce5d/tikegojumufiw.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/u3pq175pv2puer2rbds4vqscn1/50693379287.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce43902a771---zubetebinemabure.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f594e6294d0ba2589da7c576461a7794/27967175656.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b92c9e539749d66a60c15ad236b6d26e/54695089306.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3af602233---26083882963.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80218670448.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502d7bb3ee---xevibimazevixa.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/53142024169.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e70facc80---wamogesafoveguganafido.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160917b3c01e08---9819670715.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/n1qnbho2ha66mf3l1v597clp0j/rojudanolofokavukoxe.pdfIn PDF document text
    • http://boxethai38.comupload/file/minudolel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9e18a234---96696789488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=demon+from+lord+of+the+ringsPDF link annotation
    • 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_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 10640 bytes
SHA-256: c1b8d7f0ef2cf341caa60ee16739c863d06e76dc29c9efd21bc3ebf31ce8d1b7
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 16868 bytes
SHA-256: 1d2b2d2d97c84186fa89118d14e387c85e675c5d690e267782e0efcd64bc1822