Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f869fb7e652b9cd…

MALICIOUS

PDF

86.0 KB Created: 2021-07-19 16:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b4027276b34c710421c4194b8d72bba SHA-1: 7d173971bb4fc7ea063b293154f053f43d321ba2 SHA-256: 6f869fb7e652b9cd9a3499f03144c8256bfd92a78673f3394dd3d0d3257089e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c82f50851a03ae70469e8da99481dd49/44467863296.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7469d8792---pilofovujemo.pdfIn PDF document text
    • http://abnicum.com/files/file/kedafufiperuwokezevox.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cc10fccae9de221935163a46deab5122/26474324130.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/37431431337.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/96638770572.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/xafabarix.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bcac3a17bd238a3255aa4dd599d0ec29/42443589623.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/69120225319.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/53765664185.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/mamejabozakonegavesi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9e2728cf---42605370762.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b67c1125---53388824554.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/aa073b00aa676f321d71a634a4383e1a/17876398298.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaae9dd30f---30747835143.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/fozemakavak.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fesexutozuwefodixufatuw.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/togegedozezulofazuvoxuf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e328ea0c805---95674733892.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/wolikolufubu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b245c5059ca---xomoxudipogevawa.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081781790af5---28522421007.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1300b8f165---50599417942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=corporate+style+guidePDF link annotation
    • 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_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 17184 bytes
SHA-256: 1ee7ab8224fcec1ecec7609e2ff107421221bdad651cd9b9a75cee6840238eda
font_01_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 10708 bytes
SHA-256: 41f8511bd3c284919bbb4f3cfab791ea6913d5c18624426826b718ac8d723ef4

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