Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03933a7e9910520…

MALICIOUS

PDF

102.1 KB Created: 2021-07-21 05:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 04fc4724be72d2262b1edb9729f3895a SHA-1: 1c45c4dd75807dd4d578406639ebe5ff8df5f622 SHA-256: b03933a7e991052081a9f383be309a3ab7c1f54188e3e6bcf63f83a7e03b23fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the redirection or further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1fbb90df---56732549755.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df1dc7df0---nipejutomefogusavupiras.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e009b97fa---geretifoje.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19ea565c23---46503593677.pdfIn PDF document text
    • https://puppometalli.eu/file/54819015964.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/11970b55126542d52e74c448d3c3849f/47410087156.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tofenexilofapezim.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/56377849109.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/61255091636.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/misixu.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/9010114435.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/91604928489.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3e47101a77442a15c7e98588e8527fd1/35821718895.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5975c179---84566910569.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4f85628e---vulufogipovabazumo.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/ludasigilosexifodef.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/99978835961.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160977fdd05677---fapateko.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/982eb6304408a22a8d942238275f59de/5997582238.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/45081079053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bring+me+up+to+speed+synonymPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000113aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113AA 26948 bytes
SHA-256: 8f291fbd43473983fad29ea79403845ecc5b61d1a23ae199c6bc190c1d68dd7b
font_00_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 10796 bytes
SHA-256: 251b668c7fedb5f36a4e8ba04e1bf72c8acd0dc624958897fc641a8b3a89ac20
font_02_sfnt_off000140f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F2 19216 bytes
SHA-256: 07db516d183f5d763d89041c841ae2aef8e72053e193481c73a127e3bf53fd77
font_03_sfnt_off000172c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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