Malicious PDF — malware analysis report

Static analysis result for SHA-256 103a68432abee34a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 09:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3cbe67e53483952a516de48968ab21e SHA-1: 721de11457ae1ebe0d0fed26888876e52aaaa720 SHA-256: 103a68432abee34a16aebe83a362620e44c439acd3a9b3ac8c0a9feb3a07b91a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=gta+3+anniversary+apk PDF link annotation
    • http://ozgu-yapi.com/firma/files/35293972035.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/25016900290.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/javizuregut.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/40575075574.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/rikovilenilipifosa.pdfIn PDF document text
    • http://szpk.hu/_user/file/88924760931.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/bususenorufamujivavikorod.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/87332843130.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/31432301181.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/liwuxanokaletiwajo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130669854a63---warulak.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-6/20210906050642910985.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/30597921127.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/nuzafipo.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/32162663748.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384e5db52e1---torigo.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/dujutapiroxivuxuwid.pdfIn PDF document text
    • https://ptogel2.com/contents/files/74534016457.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/gesagorofelaxoraxojuf.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/83946031052.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/63909551371.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140973da9d76---17646983101.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2fda5253c903763f924013536e0bdf92/nulimobezag.pdfIn PDF document text
    • 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_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 10560 bytes
SHA-256: ebf160a5969d9359c85fd8170cd3dfa4f224142436d69c86c309d60a84f3de26
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 18564 bytes
SHA-256: e3f5bb4b8d119f9b2cf6f5f4c8430bcaea84c5fd3cf73b79527f86dd31ec607a
font_02_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1