Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4b3da0f307de09…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 00:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c9d8c519af79c496c76f1157404c282 SHA-1: 1deaba2e4b77d99723a0f500becf308949acbd64 SHA-256: 7a4b3da0f307de092db0a14122b94ec33ccdf0673ac63ed507c1be499261839f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=smartphone+under+5000+in+bd PDF link annotation
    • https://go2germany.ru/files/file/55516650362.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432481c7f6a---77973848943.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/gexapusulivefasib.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/feronowom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438ea92e6f9---mekometudafolivefotegami.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/52598561639.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/kasalerojuwidufobutebiw.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/pelunufebagifepewobi.pdfIn PDF document text
    • http://otczenacts.com/media/files/mukine.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/banolopabulik.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/mofil.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132121ad33f6---81645759285.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/45507939911.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109010417589790.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/nisurameduresexilotur.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/jigamokojikovajixofomelu.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/kutaxupejatiwa.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/98981027503.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/17771554649.pdfIn PDF document text
    • https://tigapilar.com/upload/files/nadebapiloxa.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/64503301083.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jjfs6iiqs3vi61bjspc2jqn0jt/13074619075.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369a57656a5---84451659388.pdfIn PDF document text
    • http://iscelenie.info/files/file/72264921402.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_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 17456 bytes
SHA-256: 4575a49f36ffc929e509a8b341fc42121f5d0e3193d9d58d640a31ee06399a53
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 11016 bytes
SHA-256: e5bfeda1c1d1afd998576c7fea6daae531d8eb19d0bba13585537d12a5b74d1c
font_02_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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