Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbc491e8f1b205b…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 12:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30462f6c4de1c4069871bf199f3dcabc SHA-1: fe4c8816c9620d714eaecf57c7fc0acb2236373b SHA-256: 9bbc491e8f1b205b3ce21b0a973e49c948934bdfc282d5fcd5b889add5323d3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of urgency language further supports a malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=how+to+find+answers+to+any+question PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9a00jqj9n8dsidfg1ere74c6du/masaxug.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00be75355---fodowofusilisifutoketazo.pdfIn PDF document text
    • http://chromoink.com/updates/file/76225943914.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/67086383516.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf8f2c68b---womudamonomasuvekijamawo.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/24210393377.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732b27362f6---72258293441.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b4128461ed711f3f8ca7ba4d90a52aee/5058286763.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/67282579548.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rcm90rnfde4ek885uqt41d7hic/pidukozixirozowulomogaxez.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09de60dd39---39820792706.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/jiputozujuwikiperu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/64746426b78e70df8d36b704b277529a/45556495230.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4de17db4acf9035093eecb1b99e8ab80/91525338421.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/4de6c4ts9f0u3maofmsj22bava/towabaxere.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce049438---82770413450.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c3573004---jurekisagonadapokixe.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/957f57dcef36859d31977fe61ab7bd85/nusonunebavi.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/bisiwudupatopo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077913e1d46f---wotebezawarajozasi.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/17889909471.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dc94babfb---zupizitavakesu.pdfIn PDF document text
    • http://dogable.de/userfiles/file/runikujopibagixepadinofu.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_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10736 bytes
SHA-256: 024d9935e9b6fef06ff1bae7c61a1d247ae9bfe513ff6f45c01468fe397496f3
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 17288 bytes
SHA-256: 7f4c9d682ac618e6694edba01f6559195fa8b4b602cc15d9c22e057dbb9dcd52

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