Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d710ab63f0a071…

MALICIOUS

PDF

78.3 KB Created: 2021-08-30 13:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b5a6f2a0494ae1fdfa0ab7fd7722e26 SHA-1: 60b9e9757cdcc41bf220a0bf1c4b1dca8e97a8cf SHA-256: 40d710ab63f0a071ab7d568d7d842beef0f986896edc5470d8fe04eb0c576d03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code or redirecting users to phishing sites. The presence of numerous external links, including those hosted on compromised CMS uploads and disposable domains, further supports a malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://adance0112.com/upfile/editor/file/movofugolizimoxevokabo.pdf In PDF document text
    • http://vipdiler.ru/files/file/92674854434.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/riditigoxokigaferuv.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b656a3fb26---70854553547.pdfIn PDF document text
    • https://brakos.it/file/40482286655.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/32976255865.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5379413c76---38552693065.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/fexemumolurepej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d937cb969c---50438289184.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/kijudivafatoronumimawaroz.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/gorebuxar.pdfIn PDF document text
    • https://anup.bo/images/files/buruwomebamizosu.pdfIn PDF document text
    • https://telenovella-bg.com/files/fozezesujapotasinoj.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/kenevapuki.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20216724526.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/surojeva.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0d2be1523---refamurin.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/50632232155.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/32044551071.pdfIn PDF document text
    • http://etre-belle.su/images/file/gutejusufugevo.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/jejamujimeparipa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b34006b6a71---72197632367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=interview+questions+and+answers+for+assistant+managersPDF 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_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 16096 bytes
SHA-256: 9e8e33bd18e8e34d65d9d74423c1186fb2c387724af97fd15bdfbee83a64059c
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11000 bytes
SHA-256: 7a873e843f78d7a541e113ac018931a8c254c2493ecb37505daf0b1d909e0dac
font_02_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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