Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea685f47366e2a77…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 03:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee4ad83974da6ddc51756bed419c0559 SHA-1: 21f2a7e46094ca3ccfcffc90a0438e0bca67aca7 SHA-256: ea685f47366e2a776b375e488892ff458f39d02cd90722e2f7df5842ef2b545a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981816071c1---94184306594.pdf In PDF document text
    • http://cloverpark1959.com/clients/51168/File/kexunibodibukor.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i8en8uqtlqq3jshm167uakb936/48541843553.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8gfe4r3arsku1e72ku9e1aq341/fofepezuboguvetudem.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/54957848522.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aq18hrakg41guifkblsh5heai1/mesumajasokirivadug.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47936dc3c---vodelomirinonorate.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4b6aa645e6d8466fbc8d5537792ca331/84092654848.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/33c58a259a761c35aa9b8205a4f2e6c2/56283845265.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7e25d1949458af25b41d61b5b6f24fd3/somewonaxifoja.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/42735805841.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ne2kpsgfb1ku89lrejklle4i9/50657632423.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/59047373116.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/65359048739.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1573eef64---27599636951.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a049c808a89---99473504874.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/resexi.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/busolufi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b75d79fc---giloxapolad.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bce93cb9f81---popupesosuvofovu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/rijuter.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cc9f17d2586ec27606bd105182ce9f4f/boposesixam.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d5371e48---digef.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/forewuvorexi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/soderugitusulerukinerabat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+long+will+a+ticket+stay+on+my+recordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17016 bytes
SHA-256: 4c44e9c0280a3781f33d095ed14f10e9b42da9835aab19f48203f000b8e509ea
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 10996 bytes
SHA-256: 39a08354b04d6b8c16fced22210aa83dc43b630fd9f69c872df0b46d9ae8ecb2
font_02_sfnt_off00013830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1