Malicious PDF — malware analysis report

Static analysis result for SHA-256 993647fe59abec6e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 15:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f9a2929cd961c9ca65cc30d4746e24a SHA-1: 079af4c6e36a1af3d910d5b977e42a2492f247a0 SHA-256: 993647fe59abec6e57ffd179a35eb157e50a0d7ee9eb62df00237e5520e258a1
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains multiple embedded URIs, including one pointing to a raw IP address and others hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eternaseguros.net/files/files/39623653351.pdf In PDF document text
    • https://illustrations.noche.fr/images/files/37517164525.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/98114673269.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/tixotevumirobugezopaba.pdfIn PDF document text
    • https://photojet.net/userfiles/file/kefedasifapigogegalev.pdfIn PDF document text
    • http://melz-feu.ru/upload/fujelobozexifapelimo.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/manejiguxukirosaze.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/89180275613.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/palivojexitezut.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/65893659827.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/9932579435.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/xanazikinobasejipeginiku.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/53191302398.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/14356496263.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/41542035218.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2ik378te3c93aee01rk6iq1os1/xotipojixukox.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161380432e6d2f---lasuvolaxadozerizoj.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/35812880877.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/23143617457.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_014302.pdfPDF link annotation
    • http://keramann.ru/uploads/files/sejeniwisijorufu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/022a0eb036e7da59d2948dabe3cb1b29/doseviwojipezi.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84237107832.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/jutipow.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/dofigaroxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fnaf+1+free+download+android+full+versionPDF 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_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 10528 bytes
SHA-256: f2b5167c8a546a11f658b0db9ead66e5100849cfa137f6e50ea7a7f12bd1071a
font_01_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 19052 bytes
SHA-256: 98ad4189d4793c883cbce0d0664fde56b93d1acf5c770d6ceeb7cbfebb81e309