Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24ad510b1261dfc…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 03:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed23c06eb21cb1025bf7db1e59e33056 SHA-1: c042b18d171412ab062fad59ebcbf563c47c8a89 SHA-256: f24ad510b1261dfc4f7e9492f7a1ff3d170a7557e0986dc43e50ad4c87bc8554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of external URI links and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=actinides+and+lanthanides+pdf PDF link annotation
    • http://sethhukumchandschool.com/userfiles/file/gezilaxikuxuxuganew.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/42931391796.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/xoxujavuduvotiluzatog.pdfIn PDF document text
    • http://chemicalengineers.ie/images/80427651530.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c5e1c440---77570474625.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5cc9ce07---70902766054.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/fugubonoxikewawipudefesab.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0f9cb23b---95715282831.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/29233100091.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jomomo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/77069995800.pdfIn PDF document text
    • http://fittbikese.hu/files/file/84314568813.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/26282689031.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086693f74806---wunibagevibirojina.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086f05d75f39---titafazopixujadesogagop.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075510f067b9---nisakujogesowixaxar.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/lilirafakakidalari.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/gufizozakolojakejup.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/86933435063.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/58887337309.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84675466412.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4d365ae3---14352717146.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/bimixokololumisolopoxemir.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_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 19504 bytes
SHA-256: 1ed195df34029cec606d5dcd2a147ae250638006c682340162c50cc8fc531edd
font_01_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385E 10476 bytes
SHA-256: e4c7ee428dcce9153ab4c914bd49500401147ee17eb44f6bd0aab0145204855a

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