Malicious PDF — malware analysis report

Static analysis result for SHA-256 64536527fea1260f…

MALICIOUS

PDF

78.4 KB Created: 2021-08-28 12:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 687036ab6a0cacb9a3f0ae549ac24b27 SHA-1: 1a5de069a8ac71f40ea95059ca37072b2453ca48 SHA-256: 64536527fea1260f1ef657aecc3f923264c7bda8cded56c841b670b5fdb42abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a distribution mechanism for malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware delivery vehicle. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fa2b5bae---lamalu.pdf In PDF document text
    • http://villa-margherita.biz/userfiles/files/79246968566.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/78177476472.pdfIn PDF document text
    • http://yongqingtech.com/d/files/4781328227.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/dumafekujul.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sogadisa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d3ce6c211---guxumivovafed.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec79ca4fdf---38809162219.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/57605193008.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/64870976802.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/54732207185.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/212f164ce00024526ad7bba24c149384/wawow.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae10c0e554---fejoliloka.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba83e27ec1---lafejonojiduj.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/mumujalopijera.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/99492489629.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d169471f9a---25335821641.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/gibuxenepiximijinaviran.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922ebb08c81---77670588104.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zerebiziruno.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/45390983054.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/26160473845.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f2e0dd343c1a958b99f294edf97f75f9/wiliranorakudobisaro.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f82c7018---29239077844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ombre+long+square+nailsPDF 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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 10764 bytes
SHA-256: 5665de08d5ccdcc49bf824d1be854062808b7acfbfec1b6ff03961e3c092ed4b
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 17576 bytes
SHA-256: 402ccc8c2378569d7f154bcdf9939d97e2aeb80764f410d59b9114ed2667cf49
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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