Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7139ed005c7d857…

MALICIOUS

PDF

361.5 KB Created: 2021-07-01 12:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0485b9e58b2248b0ff2df405f1d1b2c2 SHA-1: 6cea7d7c1930e19b1489da8263071a970fbf30df SHA-256: b7139ed005c7d857cadf492df57d5dde58b1af8869e0d909343639be7cb8987c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host malicious PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of further payloads via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9760

Heuristics 5

  • 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.
  • 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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc92479e45---tabafifakerugokuperipa.pdf
    • http://ahchala.com/img/file/51466037474.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d37973d202e2a611c54963400e6e3fbc/63930025838.pdf
    • http://learningkey.org/userfiles/84045264186.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e3d7bb95---gepilozomi.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210610_0FB2443BE67C62A0.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/wikisifimuzozekogiporez.pdf
    • http://techhssilverbuffs.com/clients/61416/File/paxazakojexu.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084738d069c1---91274027882.pdf
    • http://dentherapia.hu/files/file/gitotedewana.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f2294908---xatanomesidemikotuxovivil.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a54789482---zijulopibosuzonoxawuvoro.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cebb63deb---23635958794.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3421a3d7---61374013975.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a0890ba1---45885472077.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/aqicnathr1509ppn080b91vp7a/42934191077.pdf
    • https://tortugafilms.ca/adminfiles/file/zuditibibutatupifofowav.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444d766da5---komafuwinetowadunanogusom.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2uah5da9vq8on2q0a8vegd98a1/45224118237.pdf
    • http://computer-rudolstadt.de/upload/file/5061129810.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf87b2601---vafezozagufajorem.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3900891fdd---suvetibajeduwezifu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=any+man+of+mine+line+dance+step+sheet
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8cb038e80eb6ee1ef6d8ceb281c725d9/6568497062.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00051bfd.bin
875759ffd1a75b9e38eb75be89fff16894554a69fd828d57011e313c7af0eebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x51BFD 19484 bytes
font_01_sfnt_off00054dfb.bin
8076f31695501d474ee36c51ad2dba178963102840abddb0de50e65b9e7bc852
pdf-font-stream PDF embedded font (sfnt) at offset 0x54DFB 10880 bytes
font_02_sfnt_off000566f7.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x566F7 16312 bytes
font_03_sfnt_off00057d02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x57D02 16792 bytes