Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc43c570713f6fc2…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 16:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f031712fff03c4d378d961daa8c7d9a5 SHA-1: 438b0d139c941ed92c3f66f5b0055643a9e03229 SHA-256: dc43c570713f6fc22ff144a317299f7db70d6d5bc3dc956a59df504b5438d935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hippodrome-compiegne.fr/www/uploads/file/15637891932.pdf In PDF document text
    • https://autonoleggioassereto.com/file/zeminujorosake.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/fusedizixefa.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368bf6bc98b---rufojejenametovokijexadil.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/wawekiwuburowubutifuted.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fisitemuduzizenataruxe.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/jufasib.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/femabibotifu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af59441c3a---28343097011.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613358566d9cd---82177326396.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/16668721458.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/10517094991.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/tibubosipewazesasevosilul.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/21494459102.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/pexivovumegejubirukufu.pdfIn PDF document text
    • https://la-klamm.org/Files/files/munapajupedelojaresivol.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9d067038---31299365329.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e1c74b64df980f02ab8c5d188b6ec4a8/jukafetijagajivodixurowo.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/semafepoxu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/764b8971325dfc8d173259c6c776a448/64008178737.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/pikujakomoxafekotamev.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/39620057323.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/tugetiwujiwekezixesav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=a+room+with+a+view+1985+full+movie+free+onlinePDF 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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 14800 bytes
SHA-256: abbec0b33d3467d3106d365971aa0ec156fc2e1c6a73507dac3129466f3120a2
font_02_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 11104 bytes
SHA-256: 90f75295aa4c4a1b941344fe6b0f858577a2c428d612e544e26b1913fbb3d3dd

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