Malicious PDF — malware analysis report

Static analysis result for SHA-256 c623008aa67fed19…

MALICIOUS

PDF

85.9 KB Created: 2021-07-21 14:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58c8c44d2415eec747804c1eae963504 SHA-1: 49ee66f486dd8c69521145e3d1745680774fe107 SHA-256: c623008aa67fed1974066ea692a13a85b6df1cfc77b5a47ee59101628414a828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/lukapaxiwojepevutemasuzu.pdf In PDF document text
    • http://esoftland.com/userfiles/file/sasaneb.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe7468974b---67375833526.pdfIn PDF document text
    • http://climtech.com/files/files/gumeginalobodijaro.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cff728d23366460ec92b28de6edc861b/dadebatifenixow.pdfIn PDF document text
    • https://puntoagricoltura.it/file/89842487821.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10901b6b08---98884403459.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210703_A65DF365756AF0F3.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/mojop.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/73135667474.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tolevulogifa.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabca1ade7a---tegodima.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///25660069043.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4b8b00fd---31845695974.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/12827118960.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f07397925---notavezaxapikut.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/tasade.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd277d1c6---5981741580.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/simude.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/kelewubitavorasuvexop.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/sezimixezefut.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b360b911b1c---4793927550.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/48149729751.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/16977259152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bacon+wrapped+mini+meatloafPDF 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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 10752 bytes
SHA-256: 5f3808e44e4430a6165861e72dba0ab310947138058004d3f594d8ffa55f7c74
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 17112 bytes
SHA-256: 19856ac4c2f391f26dfc1851e4b458cdd59383b54e58d308f84296c0d0ea112d

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