Malicious PDF — malware analysis report

Static analysis result for SHA-256 005640fba41e6bd2…

MALICIOUS

PDF

141.5 KB Created: 2021-07-21 23:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9043370e414b780069c1b6a53286981d SHA-1: 17fb1aaedc1b72ce39a2f050cb58f67f9142b22c SHA-256: 005640fba41e6bd2b7024e0d9da9878cb72f7c20dbb1df6f69e749f7b243ba63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b5405201818---74552526967.pdf
    • https://klairtransport.com/uploads/files/26106796639.pdf
    • http://belst.by/upload/file/najiwasodufowujuw.pdf
    • http://toyotarenta.net/FileData/ckfinder/files/20210709_F647E6B0B5CA3F32.pdf
    • http://activesolutionelectric.com/images/file/98391988134.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739c493e6fb---9212831613.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/59c61ce4830d7a84c2fa2d3af67db790/lafipefakijata.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/k613nfo4aq7boigbnfonmm1smq/60071285558.pdf
    • http://okzawidow.pl/img/upload/files/pagabumamifobemakopa.pdf
    • https://mvpartners.be/images/uploadedimages/file/kebusoxalozipalan.pdf
    • https://planet-for-events.de/userfiles/file/bomuwod.pdf
    • https://andhimazhai.com/images/files/15924958043.pdf
    • https://kaptenhoki.info/contents//files/zafasub.pdf
    • http://iehyun.com/editorupload/file/visuruvivovonafow.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbb5c9cb5---xilirozetadenopapus.pdf
    • http://hocikto.info/userfiles/file/4102796754.pdf
    • https://fisheaglesafaris.net/pics/user/file/gegub.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/xatofenutumejejobab.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6c47d5459f11acf5aed71b7be6eb6109/56960820700.pdf
    • https://maxflowfans.com/userfiles/file/77958248622.pdf
    • http://fandimnarodaku.cz/upload/file/27743766603.pdf
    • http://griswoldremgmt.com/uploads/files/zeberamavopuj.pdf
    • http://ggmtc.net/userfiles/files/wenajodo.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/864098d4a40eb3d1e584f5ecde6d1287/63250429939.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/23898655274.pdf
    • https://arendic.cl/files/sawogosidisex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=newlands+law+of+octaves+elements
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b7e2.bin
4fd830b0ae5f6a2f19d8cf01e053d3e35b76d514cd63d6f45e8af896229f08f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E2 10576 bytes
font_01_sfnt_off0001d01d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D01D 16792 bytes
font_02_sfnt_off0001e82f.bin
e360afc8b65a9eb6acf47d967387a96ea2cc009ddfc3b1b63d94876cf98cbd32
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E82F 25772 bytes