Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa00cf34abcbd5b…

MALICIOUS

PDF

72.8 KB Created: 2021-07-10 00:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e50d47fd2ce962cabc2ee44878fd02a SHA-1: bb09301b959053545d56029a9f7d1d9b3413a450 SHA-256: 4fa00cf34abcbd5b0b79ed83137b0c972fbafc03961b80c8d4b5dbaabc168fbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the listed URLs, which are part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chunmianxian.com/upfolder/e/files/20210630074412.pdf
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/sapowewimu.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3ca395228b41e0c4a37c2f99ce19704a/jevuzoripodamuxanezurexo.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c331e9f9a642a6422dc5e89910b47221/44531213334.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab154901bb3---sivoremezuwodetejuwoga.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609202a3e2f03---35980387404.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/25e0d29382abff17c05429b8f422d0d3/95348865540.pdf
    • http://nw-line.ru/generic/uploaded/ginizabufusumagu.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6dojeba2efclajtffq112dr8iq/sozule.pdf
    • http://mousike.it/img_ins/files/zowejawidobizugoromukefo.pdf
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/2816120265.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd22e10f2---mofodekara.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d214c467ba57f998d0a0bd5b70496e3/90536545201.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/xukinexabilafajurotara.pdf
    • http://amdind.com/userfiles/file/45940735326.pdf
    • http://lideparts.com/userfiles/file/1624187480.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/90959136990.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/heh3d3k22bplo6dmq9kklm0bro/rifoz.pdf
    • https://songhong.info/userfiles/file/49743832789.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/samamavasironake.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4401285a---murojogarukitokexodoveru.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1d8c343b---31571634834.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=32+awg+to+mm2
    • 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_off0000be4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4A 16792 bytes
font_01_sfnt_off0000d661.bin
0042c0e42660c43c022169ca0ac0b485ac9afbe47a083dc17db050984f2b253c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 10092 bytes
font_02_sfnt_off0000ecfc.bin
381b12f4ab7bfcf16b0cbf625e7ba247a6e2b0787f1ab6d4bc4e0957c1175851
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 15944 bytes