Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f72c2b884229c7f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 12:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95300ee86c39e25658ba82aae00e8c6a SHA-1: 749646c133d47d5ff120b5e64e3a49c321bd983a SHA-256: 7f72c2b884229c7f26c22f966d4a64e505c07c478862b31c37a377a301752aff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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://www.shjkyq.com/up_files/FCK/file/vonivop.pdf In PDF document text
    • http://agro-partner.com/Image/files/47954845057.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxatulutisumof.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a3a53cb2e6a7f94e504822cf2f632bbe/fuvawagekixufikifo.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/72550935731.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/metipasadeseno.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/62584707230.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/37605372071.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/37205282871.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/16520610486.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908221401.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/67058207308.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/55720810454.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/5931707970.pdfIn PDF document text
    • http://kasand.com/userfiles/89885782033.pdfIn PDF document text
    • https://etimes.mn/uploads/files/fokaravujalilijowur.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/80186522971.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xitoxumujagefa.pdfIn PDF document text
    • http://93564497.com/userfiles/80133880379.pdfIn PDF document text
    • http://ossokahve.com/upload/file/luwazimanozulupi.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/51963927720.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397097933c8---9839579356.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d751b9ff---biluxe.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/sabarepigutidozomebe.pdfIn PDF document text
    • https://begili.com/uploads/image/files/96896589307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hitman+apk+for+androidPDF 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_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 10396 bytes
SHA-256: 0bbb6fb630fc1cc5d15c3c184db4d9b58123fb503f9b48151469e7a429c2d33b
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 15596 bytes
SHA-256: b803b8bd1424ffebf79f7ca7f5f1feeacd984dc0122eebe92536e124a02bb669
font_02_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1