Malicious PDF — malware analysis report

Static analysis result for SHA-256 972915e112dbb1f5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 23:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1210e9be9755aa72c085a48120ff8feb SHA-1: 1877865439bfdd91f13ba4bab4bc97fbc8f6c708 SHA-256: 972915e112dbb1f5e3617f1b98544b436550bc295f04eeaf378fa1f8269caa02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is part of a link farm designed to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://shsclassof1970.org/clients/872719/File/43281885983.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/rogiwikopubowituxoge.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774cd26943b---gixatewete.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730253be51b---pepigirugexuga.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/39146530657.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/96962621527.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d66d789f---bopezawimunogubudizig.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/nuverug.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/77011751443.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fac61cc9e---86246887989.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085497ddf1cd---mibapinutefoxinakebisev.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d9c0755140f5d9845d7d7f6189e8e0d6/tulibisiz.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/60159696493.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161288e9442ac4---58320361082.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad99f2186---limefopavira.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/88439505413.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7954e7c3---54035573812.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810553f306d---71086288065.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/42968433719.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c085139f---98278050371.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210803_CB6EFDF7E225FD67.pdfIn PDF document text
    • http://aimic.com/userfiles/file/zilamidanopulikotukow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=financial+shenanigans+4th+edition+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/59171750875.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_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 18368 bytes
SHA-256: e08b1ab0df4c8f37d283c8f367c4faa6d2aad78fd4cf29c325fbd56ff512af66
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10856 bytes
SHA-256: 40808ba3a8fac64e0b777a90adc929ba8275883f4d36c0b4e81e56936f2add51

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