Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22d7e627035c5ab…

MALICIOUS

PDF

79.3 KB Created: 2021-06-27 20:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bb861a172f3df2bd806c3ae59f060e8a SHA-1: 5499b6eed279f7b6581a4e70d924d878db4e7ee0 SHA-256: a22d7e627035c5ab27a41b1d2edc59967b9af55b4fa64ed60d78fcfb706556ce
196 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a payment redirection lure. Multiple heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, likely to facilitate phishing or credential theft. The embedded URLs suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://allytemp.ru/uplcv?utm_term=buy+here+pay+here+boone+nc PDF link annotation
    • http://asustainable.com/global/file/29494439629.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f6b036fc55ce2c3daedd003c1bb07904/genexaramokatosalusizo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5a3afb587a11c6043f84c4683ea860e0/38663244208.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf909f2a8---9915947753.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1qtsipe3jcmj4b6n244iqdgfna/4361408375.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/labitemavilijadimubibol.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/26223342855.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5533f0aa8---76243087458.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/majutebox.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d76478244---segimej.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b30e108b3---77077442908.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/stu7igkulh0dpd0p64gkluulq2/61277713573.pdfIn PDF document text
    • http://amdind.com/userfiles/file/gakexerok.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/76310829751.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e04f0888b---185379397.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/43683929037.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/jc9e8btcr5b2taejrc8ccmtmpi/85226261205.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/27611001654.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210614_727512BA8C7F8EF2.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0082b6e5a7d8cd1a61622a5588f153e3/61099613551.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b226fb1c3d896e0e3b0fb5cb9ba1ec69/kulin.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f71092f6---66363625436.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/rowutulanupojedafifeleruv.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/50dbb789a530f7087caff5a55b58ae5c/43359472463.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 17084 bytes
SHA-256: 8a080523ec24fb40032def2d341b408eea9e07da044df3506ca7520650b33340
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 10476 bytes
SHA-256: a7074324c4ee2d4e7053ba18a4cab5d79b5adc7b17a32327bc4282cb806438da

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