Malicious PDF — malware analysis report

Static analysis result for SHA-256 92342827e1fc68e0…

MALICIOUS

PDF

70.4 KB Created: 2021-09-23 03:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c9f6380bb7eeae5e682e7c9b4c1128f SHA-1: ff37663d949e62963d53fe8a73b9b763b355de96 SHA-256: 92342827e1fc68e0e44d4804f556e56ffdccc55256f6d2a0374488929504b217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing 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 phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/52881756761318166dba92.pdf In PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/82306279100.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/7049395365.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210916103027.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161476bc927a4e---jisamebazise.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/gugumijibidopofaxivi.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sixapemilavutuv.pdfIn PDF document text
    • https://lazerom.pro/media/file/laselurisu.pdfIn PDF document text
    • http://rhondachem.com/d/files/34284148115.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210910091800.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/rupasakekiv.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614553d745c10---61884157140.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/fakiditamomesezuseko.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/55681164108.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614855726ea17---neluzakufogetaxafim.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/gikisegamaxigitokovuki.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/40086437073.pdfIn PDF document text
    • http://signauction.net/userfiles/file/loberoma.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/35018950006.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-19/20210919175858691253.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac79c8e4da33bfdbc3b87d1e9d6bce01/39217234642.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/xotokisez.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/57392097778.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/retub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=supersu+pro+apk+2020PDF 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_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 14912 bytes
SHA-256: b4066fd0c95ff80272b83fb00ca182012076f7195b8e9597dd8c80de6d495c4c
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10412 bytes
SHA-256: a2f9d02ff7f34f2e8da3de296a8f3ed66807bd4503a216c1421822006b5d79fb

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