Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4484dc1eeab7bf…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 10:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b6b5f67c32fe9543a9fb366b4235b3b1 SHA-1: 67fb5dcac2c40f464666ba5f88a8a160f7d8c489 SHA-256: 6b4484dc1eeab7bf0370bc2acab12babaecc0a1fb22bbc14c1e5adc81cc411b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9ufduta3du8l8cf93fpe93sq0c/8775999652.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad7bc6f46---60363911393.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/71607175149.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/55041178853.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/durujedowiruzesoxodebaf.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fds133o5c9sdt6ph05snfgrhdp/45317949449.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/wigekovigebukuga.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nnn83rfe71bs7pj9pa22hqsma6/mowanamenaxewerug.pdfIn PDF document text
    • http://centronegozi.com/public/wogovak.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zomovovobipob.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/55f436848f57a9d7abb1a7c4425edf78/rukezukusokobavemuxuvo.pdfIn PDF document text
    • http://ahchala.com/img/file/60649240118.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37dff53a25082d86c93c23258dd3f29d/20147397621.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ede4b50d7---puzekowopi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2f638a4ba7d2d2d87ff907847ca0fa5c/jelijanodizasixutapev.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162420123477.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/92718935970.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/mafur0q0kipk5sp8a2660n1t67/70490163519.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1b6c4fe3dbc8dc2d951e11477c390dab/nigexevigamotonasewi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5984b3f4a---19104905130.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/17850561587.pdfIn PDF document text
    • https://eberli-medical-supply.ch/userfiles/files/kisota.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ad9795c4f59c445ae910bf8f66022de5/28654778516.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13c55bfcc---bifuredutagepoxovenev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=elements+of+information+theory+pdfPDF 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_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 10860 bytes
SHA-256: 699b4161d129d652ae32e855ff8554486f37a18e78c58e900bd5a15453d68f49
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 16912 bytes
SHA-256: 283f60671705910c1af6ff639cf431948bc1d8f72dbf34ff74e5489b6bb93b38

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