Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a32c79130e7c950…

MALICIOUS

PDF

86.7 KB Created: 2021-07-20 08:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5286d7bf6905ef78bfdb3156bdc48376 SHA-1: ce331f9c499ca207cf5beef9550f5374ec1a4216 SHA-256: 8a32c79130e7c950fa56975250963f261876674e64b98be4ad9697332f08ea9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3729

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41fb52c29---fomirixexixugozasimenob.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d1c1b24179846d8246ec434ccd9a293e/nexobew.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/surosogisikefap.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/13448120885.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea35ab549---98142203222.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8925592d---16207294584.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/jujiwudopegur.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf1420101---mowutumukelev.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/19125138427.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075246351892---47627824046.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091a8e404821---zodadunimali.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/52259183389.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4383a7dc90---73155413527.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/xilixuginavezov.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/5963183074.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m1q93b01bnvres3ha5f3fp6604/90649786654.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/10579811876.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/romaju.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086a293254e2---82631137042.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qka2bk4il9gphff4qbfoo3hc7e/90242778532.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d60eb4d6ee11861bbfd29d037a2454b7/44420817387.pdfIn PDF document text
    • http://beiks.info/public/file/larikejojilike.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/99484730603.pdfIn PDF document text
    • http://co-mit.com/uploads/files/24347675903.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/29471167651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ent+specialist+near+me+open+todayPDF link annotation
    • 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_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 10772 bytes
SHA-256: 3b5c3c64b39f3812f83cc5461c82ae81575e5a48a394c8835e0a1f6c34ff678c
font_02_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 17176 bytes
SHA-256: 80d0554a4952cdb78d0bdf6615f307c6a7292b94209ab67720f8ddc1455a3dca

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