Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f301f7581c1647…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 02:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57998ab1656cbd25f83e3194f7298de4 SHA-1: 3c1fc495cffa53a8b94d2df59933b68b9e0fda7e SHA-256: a1f301f7581c16475918a3a27571781efe69b9cbb81c351311fd386a99bd1150
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic firings for compromised CMS uploads and link farms support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087aa7b1c64b---diberonetufigiduxevazalo.pdf In PDF document text
    • https://virker-ikke.dk/files/40097651301.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f5bf4aa8acbc5dcaedf3e1a376f4fc5a/10823566561.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/54883224322.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/negemotaruzekoropamole.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/580c6fd092d3850a5b9c9c4dc5b26248/rowub.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a688f72702e4a8b8a1046b75592a6545/7817215361.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd84f13e874---63157119720.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/102bef7f7620fd4e677a187aa21bd2e0/37065304742.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/basuzugudenozixatoz.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/35792145764.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/16041099200.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/janaxelabo.pdfIn PDF document text
    • https://melz-feu.ru/upload/43850339772.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/16762255078.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l57f417qah470d6hu8evsfm4o0/22197347146.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/wuvawuwipufefixipekenum.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaddc5f6c9---xofikixoxalemiwe.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/73916671133.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3334892e2---kotikurebojel.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kaxifojinomenubuk.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9727dd1fed558a20b94a582b37d8c6a5/29327535719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=improper+fractions+to+mixed+numbers+worksheet+ks2PDF 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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 16468 bytes
SHA-256: e37325938b0ea9853ce9793fab9b9d79bb724bd851cb2620dcf3ea387eca662b
font_01_sfnt_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 11428 bytes
SHA-256: b0749a43a4064e719df0e4bc527b5a6a0922e33a1b1ab334da34c7265cc38e36
font_02_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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