Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd95373191d53967…

MALICIOUS

PDF

95.1 KB Created: 2021-07-06 14:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a621a768d25f5d1540c34cadb6aec2c SHA-1: 17f43c70aac0117d3c0900b8dd75d30f7ae50c8b SHA-256: cd95373191d5396796eb1f614f990406fd64fa6d0a4b143b762c026ebde63288
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1886630ba9---fuvedojori.pdf
    • http://creptiles.dk/userfiles/file/76797689000.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/62737659714.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/50754ca87976a036c6657ce47369ba36/palukagi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafdb12b08---momuxalazi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399f7266cb---sumopejaz.pdf
    • http://baovevietnam-vnss.com/upload/file/84597979396.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mcldjoj0qmoholi61ouluf5fa5/tuxaxesipowopaloj.pdf
    • https://ytdrive.com/CKEdit/upload/files/wifar.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160816109b1105---juvakubokufusojo.pdf
    • http://digemnd.com/UserFiles/file/lukarogef.pdf
    • http://armanetti.com/images/51010734638.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2uqi6vlsgeuk0ja04rfe57v1el/49409548566.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/09dfc24913e163138c0145015063d547/57148387480.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/25824325949.pdf
    • http://rungrawin-itt.com/userfiles/files/9257652990.pdf
    • http://villa-margherita.biz/userfiles/files/64937612206.pdf
    • http://partnercable.hu/files/fetimowiwokotudajidikebik.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wixadim.pdf
    • http://sequoia59.com/clients/867919/File/76219354320.pdf
    • http://ajivikafinance.com/userfiles/file/49495886368.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7d3937e0---rebulozafutapatulum.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/mitivadit.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd18be31b---62371764780.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6al6tf5elkmovbu98agqg4kh70/tadag.pdf
    • https://cristalensi.com/public/File/22275104183.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+move+a+pdf+to+word
    • 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_off00011189.bin
3cef033e0db1ab56967f894e6adcd32935f22062e8b982015ccd0b558e10aa77
pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 17064 bytes
font_01_sfnt_off00013e23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 16792 bytes
font_02_sfnt_off0001563a.bin
fda985f944fb017ed1067fc280378d537765593cc928bf4152a2e5463f830f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1563A 10392 bytes