Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00308a8fdf50a96…

MALICIOUS

PDF

109.9 KB Created: 2021-07-07 19:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04751f8dc9b6f1541c6506342370e63c SHA-1: b40560cc7f746cdc27c61a1a2ff841926c4ee244 SHA-256: b00308a8fdf50a9664c1b97fa72094982fd382f34550a95c74bc173d3f0e1668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67db8c5629---durejoviwusireragoruvo.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160adfa49b4013---36113453506.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fb4c49d2a18159f4f6c7b2ff17a9c725/kerurolojexovumasojav.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6b293bac---xisofugenegujoba.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/jurimegenokunulirenizofos.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a448389087b---67630136711.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/tofenujijikewevalinubi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/c01p8u5tma5vjqsebev7nsqam4/54234763079.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/danenaruzuziraner.pdfIn PDF document text
    • http://wirheiraten.de/images/file/pefiwobuwo.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/1451630802.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2b889be4adda62c1bb5f0f87a304d81e/kobopoga.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877c33d61de---18532773818.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k6gvjle5imj0unts0r43cuuf42/motimipatorelelajo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/86649195848.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8d9adfbb---35784470214.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/95363580884.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/9123561673.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/84825890830.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/6165052331.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9lob8vkqic55q12kmutus6pur0/zarumo.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wurogusinikamuxen.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a56365787f98402dc7f4d252b2ba9066/38647831847.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d944360f00---87405979732.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zilariferanulefuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dua+for+protection+against+every+kind+of+harmPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00011332.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11332 30776 bytes
SHA-256: 182021ab2c32011f45aca70dbcd47028d1b38b1275fb1c72f8e542c6c05f24e8
font_01_sfnt_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 17204 bytes
SHA-256: 0aca5d7be43d28571d5b95c4c47d57f00d9c2b652382236e9f41936ddde3e3fb
font_02_sfnt_off000176f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F1 11396 bytes
SHA-256: d5b4cba2f29b1c42e86951760edce6d5ccf01904c66674134920911f3aed5486
font_03_sfnt_off0001917a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1917A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1