Malicious PDF — malware analysis report

Static analysis result for SHA-256 06122c6c16560734…

MALICIOUS

PDF

88.5 KB Created: 2021-07-05 23:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a8622c6cddfc27ce3db435ef09c20db7 SHA-1: ac85a9ac3d83894aaedbb3e3357f98fd74f06bd3 SHA-256: 06122c6c165607346253d2fa88fe7f7261240d6d5c3a593069f8ec1e7f60083a
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 compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073d796edaa4---88931362502.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087241893742---36283374191.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/zedexid.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/u6of7amjsh4ack4goc45sjhnjq/noside.pdfIn PDF document text
    • https://anfauglir.com/images/file/46159257047.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/mavukisagizabimataril.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb89f811ff---81422036319.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/99402086656.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4342758faa---dogekata.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/sifuvugumegis.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a4a7e730e5f007ff8d2d53e053d8d5a6/71993162453.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1ujcr6nrnnbhvls56v7oq0vdd2/74857232959.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7021b5f3---54122989815.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/47dbe4504e52125a8de5b8112f96a3c8/82328840914.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d2067d98caac56b48d7b6eaef45393c9/sawikukejuvijukezuxo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2243f537fc---95797324471.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/16337545973.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/61718985442.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/luwifu.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/78010178976.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade718b4a6---wepotogadokidew.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8bac7d691---woviw.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xesuzuroxawofuxegig.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/lexobipa.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/20599375423.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/dorop.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0aquv76l3432074uudu98rtsc2/sadalisunadoxedimotizofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=justin+timberlake+song+what+goes+around+comes+aroundPDF 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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 11224 bytes
SHA-256: 7d70631937bfb89e7905b0bf7c9706590974eaa39b83e0bd6a298a063b31c681
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 17256 bytes
SHA-256: c37241a7fe6b3c50458128528d6c8131b97d9f5eb023b7f7d384bf41a14610b5
font_02_sfnt_off00013a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1