Malicious PDF — malware analysis report

Static analysis result for SHA-256 f735f168125e762c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 14:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dae880c7a432d302161d47e38742bdbd SHA-1: a7bb3cfce3b35a05675d2b458849b13f984cafbe SHA-256: f735f168125e762c765321cfe3b8f845dfa6ecf2db1bdceda8e6c0de3d0a89e1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDFs, many hosted on potentially compromised websites, suggesting a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://highfieldhousehotel.net/nbloom/fckuploads/file/todijawopinar.pdf In PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/jiratipagoxodevuvomep.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/bigavipilunakasezasiri.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/jaretirokiwisusapas.pdfPDF link annotation
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363cb3929ec---13362930556.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/63935180019.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/55202910470.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/zonidobirofawofapewines.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3abc820abed9e132817c50ed57f5628f/gofimogixipolumabuwokisur.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/kipowulodafanubaxa.pdfIn PDF document text
    • http://lobi.md/userfiles/file/zulexuzunopoxe.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/nagaxasogasapanadoripe.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/1575178731.pdfIn PDF document text
    • http://w-mill.jp/images/file/26389423824.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/43409605778.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/25842016359.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/96105398275.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/wadirifovesokovukima.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7fdb4f20f---65314041242.pdfIn PDF document text
    • https://advik.net/userfiles/file/70436673171.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/wofewevomiputetiwek.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/86453615434.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/15042539882.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/pomoguzuvirasanepus.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/65475539029.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/77461655430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+new+tribe+short+story+questions+and+answers+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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 18056 bytes
SHA-256: 5303e1a3437cb5a7f946258742681ca7527fac57ee00ea84a0e7793cdb27e505
font_02_sfnt_off00013331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13331 11100 bytes
SHA-256: 725700d2e1ee900a00d8b541b72032f69a2c58a2a654010c79a2fc6f4d40de4a

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