Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa1eca7126e5164…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 19:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59f3b4bcc29899408c016ff0f98e9dce SHA-1: 97032ed0c42b316ec3cc85619e93f23a8719fea3 SHA-256: 0fa1eca7126e5164ee2879cce47280d50a05f5d9def776bacc3ccfed766a06fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 pointing to numerous disposable hosting domains and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=jurnal+client+centered+therapy+pdf', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketchas.ru/uplcv?utm_term=jurnal+client+centered+therapy+pdf PDF link annotation
    • http://isvpro.com/custom/files/89218219208.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/39178396693.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f554cbe329f---jifagifotevomafalidipovid.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/tebobezujuzolujofiruroba.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/gujovawaxode.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/53175262224.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9c217e76---13395144971.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/16181160075.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e9c7d8c2---6729829724.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/7f84db1287d33e312543dc2fa741f9ef/89742102763.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s6or291k4aejp8j0n7nbqftj2t/gumix.pdfIn PDF document text
    • http://101balkon.ru/upload/files/likuwiredisod.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/66639953833.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/271349f2cb5183e1bceaef833932ade7/woruzojoxivurijamefedege.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/zareja.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cb52663948a9796d9b242100c87394d9/juragi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713f9bb65ac---pakin.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/da956b0976d2b51f056b5e6afb19399e/90857592367.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/nerorodiz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25a1830b5---37930320838.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/80e8cad5aa3517e6cf31922fade8cb52/26034126807.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/74790236598.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075939a74e17---43477896632.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_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 10632 bytes
SHA-256: 26de5a894ee204d13c2150b9619221613d3e4d23c2ae4d88ff01571aabf07fe7
font_01_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 17736 bytes
SHA-256: fdb94abbc8fc5d9e6271d8a63a4b5f4ff7cedc2a30ae207de175eb5b6514668c

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