Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61d68bae5aac555…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 15:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7fb848c001b3d7b3a40293e4c4092e95 SHA-1: 0efe1688eb7ada6a5b91399227a87f178e2dc3a5 SHA-256: c61d68bae5aac55539af26b8b856db4bf1ca4478d00918ddedf1e94d562dbdf5
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to distribute malicious content or phish for information through these external links. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.aunay-sous-auneau.fr/ckfinder/userfiles/files/bedifonowududuno.pdf In PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/79177457876.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/63920615403.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/daxizezezevila.pdfIn PDF document text
    • http://skupka23.ru/upload/m/52574096036.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132798b9bc2b---40933343143.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/rixuno.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/23911735493.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/27960911433.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/luses.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/88660265765.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/mibogirisefominomutajav.pdfIn PDF document text
    • https://polaria.cz/images/file/13594813379.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/37555558249.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/82590395605.pdfIn PDF document text
    • http://halaljones.com/uploads/files/vazujudekilezuwakaw.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/26788436195.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/10370076036.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mh3uuf54d6qd7mrga7gbvi5t5o/58234104605.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i1pm3ai7s72imspc0tmnkk4fj6/67402054659.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/38095819419.pdfIn PDF document text
    • http://agavietnam.com/img/files/zabowolelodekuzo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/108ua03qle436dod7ge7evi13g/1103603115.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/gozironazugabipozonaref.pdfIn PDF document text
    • http://beeshark.ro/app/webroot/files/userfiles/files/65268213273.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/dodul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=soccer+star+hack+mod+apkPDF 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_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 16872 bytes
SHA-256: 9d16300659b1a36b7b0276e001e7820317cb0d8225747751e770f05cfafc37b8
font_02_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 10704 bytes
SHA-256: 90ff475e7be3add67244c57bb8d0c9c6adc307cef8845cf90054b243d6c2ed01

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