Malicious PDF — malware analysis report

Static analysis result for SHA-256 938933637764bc9b…

MALICIOUS

PDF

94.0 KB Created: 2021-07-23 22:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f2926084174c0880004f094ac8940f4 SHA-1: 987603d32d175607f23133a2bff2183800f88bda SHA-256: 938933637764bc9bd4611df485bb25c22c2a85ef448619aeabc34b27e182a5ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mikomisushi.com/uploads/files/rukanofefa.pdf In PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/13735817134.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1qbug0gv5lpanruunm1teeq53j/81475174607.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/xitivag.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/uh6qg3sd9qabo0mrhv05l68f86/47906125446.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb95fcbd3d---48345373090.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/madufigopinu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/82928799795.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/wokopoxufuzuxorazogaw.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c4a08cce48352981e166e02012314c49/fefimopaki.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c734723f665---23341862508.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/tewijovipeneburololirot.pdfIn PDF document text
    • http://balone.net/_upload/file///26195568921.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9927eb33---ligesirusobepuzinasegumoj.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/lodumomiputamupavebifem.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/jatuxigifav.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1853bd5a---74234600188.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/furodozefedumib.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd41743e0d---60823345998.pdfIn PDF document text
    • https://aashianarealty.com/file/migezafuvem.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/20781399320.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/920bf69d8492c80eaea3df0b431b2ad3/dojutezutajezowumomop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=digno+eres+tu+marcos+barrientos+acordesPDF 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_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 10908 bytes
SHA-256: 52b8fdf36973fd0f1d56f44ec0e90c9626521eb26c4a228b795cafb8dd2bc41d
font_01_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 18564 bytes
SHA-256: 0a3351fe48244b821440fa2204109ea125bdaf647dca87588d1660fa6a41ab14
font_02_sfnt_off00014fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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