Malicious PDF — malware analysis report

Static analysis result for SHA-256 0612fd70de8a7266…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 20:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fd5d9be99a90650ea3124eef04b2bb7 SHA-1: 377613956d0458cb14bfda1fb5a1f2473f95d2d9 SHA-256: 0612fd70de8a7266f142ffc0112a7255cf136acc974855ef8185bb62665c810a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The primary heuristic indicates a link farm designed to redirect users, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=super+mario+64+ds+apk+download PDF link annotation
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/jalofukuvoxetefaw.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109160433009626.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a183425a41f72eefd15b632d48d68718/1308145800.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/wonufowavibimox.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/vaxinugisoxefe.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/wexusinokexulux.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/79816287794.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/73ae01a08657db0b7b17fc3daab03ac8/71265300361.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/33699205857.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161486a50bb57f---19555436733.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/98219488361.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/laxemulisetewefu.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/5992838652.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/39082543559.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210911191616_1616028007.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/bakatigedojilavapenaxat.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136effa9f1bb---pujadizanuv.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140920677d9b---modovufox.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109020842459421.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hsd5orso3do5g2cjpct3avk6md/43955957135.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/77140736245.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/93557958934.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/60a942c30a3b47c30967df05a2eb141d/23670890564.pdfIn PDF document text
    • https://seger.cz/userfiles/file/11345667283.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/nipifugu.pdfIn PDF document text
    • 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 11052 bytes
SHA-256: 661f81e14d70cb5c22ef2b730cccbfd12337d8815bf66dbaaa2082d324aee5fd
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 20368 bytes
SHA-256: ee596767f089299df469cf00d48d3677457036351765af87958bb4801faae700
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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