Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf786d88f1437e58…

MALICIOUS

PDF

73.6 KB Created: 2021-07-04 12:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dfd79cc296f6490a1530e286cf667d10 SHA-1: dca219d1efa65b051ef7d784b7b59234f835d419 SHA-256: cf786d88f1437e583eaf0f2a4a341ad119a52ff00f85d845fdb3b19dca1c5ce2
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used to distribute phishing content or further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support its role in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://weeb.nu/userfiles/file/83579927852.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f014c2b064---wegunaro.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/17107554691.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/maxarukokito.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/52254898637.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/putikepamikunizofobi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4f3bfa0d95a8d6830ee118b190d8484f/91670991936.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/06da623472f06b1ec702a7b88b75132d/8708351418.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7cb86688b560ffa1dc3acb384930ab9a/90207648685.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/72387824661.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/07c6b709487d0ca71197489e450f89c9/67904530400.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/punakabumazavamufumusasam.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/41928639119.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b6e1e69bd0af2dacfd47976eabcfa6d/32956635965.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/phqpehgvalonkgrkrl6brvdvs1/ridazelad.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dd4f816c2b605baa811ff48bf609a0d/kipedabukapisaxavesa.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061416510470554.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160814cc718937---21103421482.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/g37nv4mp3h81pdfae6v1j5p477/17768006327.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/nivij.pdfIn PDF document text
    • http://jucal.es/images/file/dunoramutifiveji.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/patugagalowonome.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/bjj21ln6dfun0i1dtd5jmdfo53/rikutawutiwabo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/154633170a81bad630acfe52a0ee5133/mamogofun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=caring+for+one+anotherPDF 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_off0000c0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 10308 bytes
SHA-256: 89306fbbe7e25216ba0c2528d7eeec6a1b78f17c8c4777ddff00508887fc664e
font_01_sfnt_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16072 bytes
SHA-256: f19ba5e9af5ba61ec11e379e69e2e1b91c423ce36f9f457ff2e58fb3c247e1e9

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