Malicious PDF — malware analysis report

Static analysis result for SHA-256 68593271a88e82a1…

MALICIOUS

PDF

89.5 KB Created: 2021-08-09 20:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 911815faaecb8e8791d0a5e6fb58d76d SHA-1: 3b9138594247e855a33d62686789285b840fe837 SHA-256: 68593271a88e82a140d9d9c8efec89f91a2d1696cc8822f4f8317e9bad1e73fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amandatour.ru/js/ckfinder/userfiles/files/nukaralutupipamasepizobas.pdf In PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/maxozebowidowodo.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/67573251961.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jenajulutulube.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/81781334065.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7fb1ec3d6---30058388353.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/7439072676.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/dusoweta.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/20025503523.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db8378044---xabumevetom.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e16b84a89---79629139425.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/72300693204.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10b9f1ed1---novamosiduwagirifuniko.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8uq3l3g6ps3plqe6qcjkacgti2/67734706583.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5d5bggbdrtfd8km16ern7m6dd6/wiverapakejaruxepesire.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29f98791bf---livudafofofawumimivut.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a13e3d2ca4166b922bcd6bfb89d2671d/lepajimuna.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/cb93132c6d85caf043cd47b4e44ed72e/junuwapeta.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/deredusarawozot.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/37878982366.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/loxifawenanidavafuzidodip.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/197c80d1b4eb2ac0db2bb7cbc504b4d7/bunumuluwivajuve.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sd8g42209kmnddfel4vs923rl8/nitawomanotagizunerebas.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/gekisixutupanunomiz.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/towefoz.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cc85d1c8---82912161702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=missing+letters+worksheets+for+kindergartenPDF 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_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10804 bytes
SHA-256: 3a35f48f1d51873163ee47b9551006230b6dd59248200e22260b3f1da5d10c26
font_01_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 19388 bytes
SHA-256: d55a7616b3858609a2b55222564d683313f41357932dc4299c4302523e0792ee
font_02_sfnt_off00013edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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