Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c976945569eaff…

MALICIOUS

PDF

92.0 KB Created: 2021-07-20 17:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8b8a505455922a6071dc7d42691c9d0 SHA-1: d7075adc23e5d8958a240582710520b3ddb24cc8 SHA-256: 90c976945569eaffce99d0c1fcb8740d26dbd190dd89f857712088d1c6453abf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly suggest a malicious intent to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://khambenhxahoi115.com/images/files/guxope.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcfd97dea9---32727901631.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/25d5987d23e838060c7e79390a273d74/485287403.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/3535602530.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sigizozobebogivutidi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9d1fbd63e2d7ff0668c63caca57b5227/38532554454.pdfIn PDF document text
    • http://stevis.cz/files/file/50192524779.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad47c904a33---lanubosuvujimijemij.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/xadawarefitikelikowawowaf.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f4p4s6ohcl5a1gsilba9j2pfl3/rokekokuxupexetake.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nodozu.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/47796251936.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/5ddc07326edb933038a5078545eb0a6c/93264139419.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/nosezezewenajevomovateguz.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/3726581957.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49016d381f---pegemuwevujazopijewilomep.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/72342cd411729fef5ee6f82aa1c5a36b/80837901495.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607999ca280dd---xazaduwivuwukezisexap.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7b5bdbce50a264f81b43683b813697c4/suwusirizike.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/172210309639.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bkbejr0spcvurlf1eeemon2ud0/botademaregat.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/42820153993.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/64386980986.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9e379a74---vazifalura.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baf385b9744---sirivufagazovo.pdfIn PDF document text
    • http://skncn.com/u/files/kuzekaxujajubaxijaxixumo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/pmb1rut57j3t6ioe0gbg3ofnau/xudekaxumat.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/fbncrmfbl6htl87a57954u8ton/13371301467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=music+word+scramble+puzzles+answersPDF 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_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10956 bytes
SHA-256: 21659d8f0eaef81475384560e295992eab75e106bc4cd5fc4923bf8a01680ff7
font_01_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 17336 bytes
SHA-256: 7a414721529d855e1073717dbf223fad92087e1e20291f219abc47d41e43ffc3
font_02_sfnt_off00014a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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