Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fdaca2a72090f8…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 16:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2fdb09966126c474cd9f860ee71def98 SHA-1: e236c644c333675ba875a0284f2a0696b09067ff SHA-256: 61fdaca2a72090f8c1c246fbfe5fbdc3f2c2c637ed44a0478b0f671899f3b9bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the redirection of users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://automotiveenergy.cz/userfiles/file/13184128755.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090770c2dac5---20283705957.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608404649d87f---8636887569.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/xitanuwasebutuvesabelamus.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/7084194230.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f38fcc2f6---28805961410.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/893d9b211c89c7793d491fb0ddd6da8a/fasudetag.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/28048073878.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/69625166814.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902a1518133---58524746879.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2883297a---66146970155.pdfIn PDF document text
    • https://baongochoa.com/upload/file/87840585551.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d093b52f242---80408810664.pdfIn PDF document text
    • https://aashianarealty.com/file/zajenomarebipuxelu.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/508363240.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1a30e7404102de4a406ee79972f087a5/dotosis.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/19813f2bcf3f5788eb7543a5f1cb42ba/99036843693.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/506836861.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8fa48afd9f---jilejeked.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d245b5e5775---beluzokadafadiguba.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dpkhp62cqsbtkqgiofb4lp5cs0/jigadotavoxosobojun.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/kobebifiwef.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/juwuvazigejija.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084aaedeb5c5---25362652870.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/55375874192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pho+with+zucchini+noodles+near+mePDF 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_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 17988 bytes
SHA-256: ece207b5e5f9c6d47cfa9413f9d307eeef3ccb2fb70f5201fab6924035f184b4
font_01_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 10880 bytes
SHA-256: 02da55172cf47356b1fc7815d3ffee4927f653d00274b6ce8b3fc83e808f7e27
font_02_sfnt_off000139a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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