Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b6025a165bbabf…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 10:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efcbddaf898343e214a6695d02215a97 SHA-1: d54f9a506c4a93574e7ebcf5a82850c5e7224ba6 SHA-256: f3b6025a165bbabf8cb354fdac1c06fc12925612178b0e5eace0907e62773ecb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/60039068518.pdf In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9d12e9d7edc953c48992a27ede85b3b8/37046551021.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/minazejobijokojivinuf.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/86925321863.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lfk5734lgr5090m7n5fgvi8k1m/kumafexibasugodadolor.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbae77a95---robegokumirobisuwonupajox.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/35ebc498728cbca4c93eb44c2082fec5/junujedizobinanexeketofur.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/87vcdig8grg7bgmcld6cpaor21/12275649131.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b86302539---pomezixugebegulepupowogo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abd32574c6f---44688671491.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/60275111518.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kijubudovonefapux.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4edc5543a---61497936863.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607822d74ee18---vanovuwu.pdfIn PDF document text
    • http://valeneighbors.com/userimages/nufibufetupojaremojado.pdfIn PDF document text
    • http://receptlap.hu/files/64899618245.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c0982beec---32374434687.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/17984513347.pdfIn PDF document text
    • http://simoncaulkin.com/images/bipoxemogaxi.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/65040152950.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/72794646402.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/1626611824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wherever+you+go+i+will+be+right+here+waiting+for+youPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/1864810609.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 17724 bytes
SHA-256: 32f19bb3291de7c1fc320c451590450ea4d18810a496457ee78fb3516df90172
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 10824 bytes
SHA-256: 4cb0787a38788b18d5dcf7a954ff8c792f0b8ea1aaa7197738d4eb8234decaab
font_02_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 2280 bytes
SHA-256: 983df2ae16c40bc31c5665b8ef5c063a6b334f6488e62f883817ab70e27f3b5e

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