Malicious PDF — malware analysis report

Static analysis result for SHA-256 605f549c3e88da41…

MALICIOUS

PDF

80.6 KB Created: 2021-08-21 18:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e537f0d103bcc63869305022e326a89d SHA-1: 99827e0a17d9d2c6d0024fc4a873e77c582bcd2d SHA-256: 605f549c3e88da41c3c375d58a70415efe3ba25b64a0cf6eab48618018415490
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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 https://pistant.ru/uplcv?utm_term=countable+and+uncountable+food+activity PDF link annotation
    • http://thewellmanteam.com/userfiles/files/nubizubewelodamunilinil.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/mepadenifanivuselo.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/73561348298.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab388885357---81872498057.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/91779604277.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3mvpqjc9ifgaqrbkgnv7j1bve1/getigoxavanazuzufoz.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a144a0910b6cc5625d988728b969fc9e/66580109918.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/kopajesibugixizekimifemu.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/fabakebe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606db2942fd55---50046977020.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/raxezesizimutiferibugepok.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/48146538549.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/54817438899.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/lv4temmfqu9dif2aia3lp4r6b3/8765170600.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8c27501977f7345a4f8022bd384f4971/11147894686.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/88778659484.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/93670033520.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/274178bafaf45127753373401c37463a/benajobolavunoli.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gexuvogogiwifu.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tevelekimuwipis.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/wupoxowabujunomavi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7r4mtfkk8ooil9akd676ebqolu/76027062898.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16980 bytes
SHA-256: caa67eeadc6143d25bafda3617ef90b7d389666f3f08e186ee44ddab7305b535
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 10652 bytes
SHA-256: 99c65d6104554d4117b9298b95328e59fff3efa150dcfdb697c284428acc7ba1
font_02_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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