Malicious PDF — malware analysis report

Static analysis result for SHA-256 901f45d08f86fea4…

MALICIOUS

PDF

93.1 KB Created: 2021-08-31 02:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba34f596b12b29bd6d03ca770737f4f0 SHA-1: ef11e65335f46329bbfa534c90befbaaacf62b1b SHA-256: 901f45d08f86fea4065bca92cd7733df1f93c300af7f49bbec7a1beb479eecb3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://crysiq.ru/uplcv?utm_term=stem+cells+scientific+facts+and+fiction+pdf PDF link annotation
    • http://camionespanamericana.com/userfiles/file/94315106210.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/zugunojovabilivujuzugote.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/wenumavunugiledemefave.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/mogerudivepa.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ff5211a6---40812386577.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/uoj3kd7sd03r7u4vp1f1fp3e81/37826640071.pdfIn PDF document text
    • https://petikdaun.com/contents//files/90089460637.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16104d5826bd08---zubixisekilatofiwufeta.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8fca35ddd8a2f6781ae7507f55ae26d2/23674000706.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf07cabb5---22152879159.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/tanusitowuzowud.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/lutopijiripu.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/13632492699.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/kipinujulenogarufale.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/43154985425.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ba643960---61914891540.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/89156471269.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/54732455556.pdfIn PDF document text
    • http://seritour.com/rsm/files/potonemobosuj.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/xabup.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/53fadcad08070bedee05c611a4ccdc9e/40807026319.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adc50340785---17994240601.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085870ce75a9---30848701383.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_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 18856 bytes
SHA-256: 839d3725bd3634fbb92c21720b2236a21c5a9ec463f0b735607a99f6b0ca5b46
font_01_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10756 bytes
SHA-256: ff12b89df9a86973551c519750b06ee9d9d5883d1e90cde8472c1913fc6395c5
font_02_sfnt_off000136c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED6 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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