Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b19ddf3e1bc909…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 03:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76880670bb1db8f96f9eba1546f44317 SHA-1: 6d7812c09ef318a33ffd192030afe2c301d4661e SHA-256: b7b19ddf3e1bc9099688f8ccb4abe9f251c01097ef7883166dd127d75fac9829
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, indicating it functions as a link farm. Several heuristics suggest these links are hosted on compromised CMS uploads or disposable hosting, and one URL includes a UTM term, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=types+of+verbs+in+arabic PDF link annotation
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/312834644.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/56925234754.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9ea2967033d59a2d080c58b45bd824b1/60362178576.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/86353955147.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/72128420966.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/e1ac1kac2h8kvpovlvhnksbc06/62106676868.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1306d5c777725fed826a11cf6dd607e2/xilujegozax.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/zedugofosurirovuso.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/lufofogodegevitawisaw.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/xerawewaminasaki.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de2693c12c2---81548876454.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/9321437039.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/15567694329.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4pmds2inus5kbo8bal40a097k2/28102785802.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/bidiwiloxaneniz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gs6hcpuqqfnbm0082ba1j033sv/fivosupukuvopi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/421a29b44bdb003cd32c143fe1431311/38919550684.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/sabatavufodobudunezivomen.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1634643c36---pimezave.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/56624498636.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5ba1e77bf01f1b572b7261c7e26adaf8/84015537237.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/94142561485.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/19824407492.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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 10612 bytes
SHA-256: 055125781ce473c631bce928313b83d3fe8b7fbff70d4d12f0a5aebf4197d829
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 20516 bytes
SHA-256: 864039368cd0ecc95428aae52e6255c8e21d03dee55551d611228f852cce3a61

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