Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a10d3d60d0d33f4…

MALICIOUS

PDF

92.2 KB Created: 2021-07-26 17:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d843f807276613e17dbdff4773613f34 SHA-1: 5996c39d2b960f667802d75a49a138f4eeec0a41 SHA-256: 9a10d3d60d0d33f48895bf7039e04aec26e74f2ccb0af830a25dec796f538b6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links, including those with UTM parameters, suggests an attempt to obscure the true destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://itchanoi.vn/uploads/news_file/94518612780.pdf
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/kodumegenevakut.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/31e14dea131e74cd0acf2a71b9aff3e5/majidiragogiku.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6073e1daaa5489bc86cb24a6226f7c5f/jumegenarixusemop.pdf
    • https://corpusbg.com/files/fck/file/22761238617.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf19371a1c---27556712691.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4emna4pf4807j4hm9n9qt8g8a5/fosofomuvi.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f61dc05b7---69174590370.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c776e0263---13643039190.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3901f07b---tabutidegodeparasupanoni.pdf
    • http://mtsskzy.com/userfiles/file/81745719068.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/narasokofu.pdf
    • https://tatsolarlight.com/uploads/files/jafuxafi.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae28bcd47---vexupiwuzovedojirejepame.pdf
    • http://kuppersbusch-center.ru/uploads/files/zoludadexepekuvaresava.pdf
    • http://studioindelicato.com/userfiles/files/silavufodugudeteke.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a962964706---gijaman.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d58aa67a---61620727310.pdf
    • http://vswet.ru/f/92978242493.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540756f6fc---tekudenedepilitotizid.pdf
    • https://karinbentum.nl/uploads/file/9130569184.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/42123599824.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/ded9db23049f1d4dffbc1ef408a46c42/38122656365.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a685e8eabd1---zokizigolide.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=compound+interest+solved+questions+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106af.bin
99d1cdcf865fc4102f486cb331c08c7b2462cc204ad48eb8c0bf0cc68595a5c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16692 bytes
font_01_sfnt_off0001322b.bin
1c44e973eda329dfe9e03bcc963a3fe5de2e92c1790e33e2c7f9b9b2cf2d210d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 10840 bytes
font_02_sfnt_off00014af3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF3 16792 bytes