Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8d3a01a5b10f0f…

MALICIOUS

PDF

84.8 KB Created: 2021-07-31 14:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5092b529afac54dedd0ff193c259d273 SHA-1: 387f4624b2512d2d032add11ce2c3f9f1a5d5ed2 SHA-256: 8f8d3a01a5b10f0fcb7a84dbc8a27d105f4730230b2b2c3dad984481ab57d95d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or other domains that appear to be part of a link farm. The primary function seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://invest.pl/userfiles/file/neboj.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded9a33581---tubijo.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/bezeg.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e9a92bdbc---muwipatapawavozejinoxesis.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wixoni.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/84444404535.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/89ff2ee0caff80a3b578aec6b82ab6e0/divipasiranejat.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/188hsl8rv7qk5lvlu1l2e4c80g/77877930059.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c519a035f6---56622039310.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4865d322be880c3a8e2fecc26590945d/16358051561.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/vojowubomigukujononexe.pdfIn PDF document text
    • https://huanghecables.com/d/files/gimifofifokugekerebawiz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3411e770e1ce790f693c76826f0cc42a/17216559685.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd263cf2f6---siwifaxogofeli.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3fe313e68ce28c48a54b973088e5d880/21962024265.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c2baf0d3b786c0f49bb7e686d81065b4/54804430826.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/zubebenowobilamokawi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/79971060563.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087d297d802c---tudad.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/23131877850.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/6143808606.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b9550ed6---zegexefekutad.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c03fc8c425db20b425dae4b4d5408af6/53035011774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chhota+bheem+vs+damyaan+full+movie+in+hindi+hdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 16388 bytes
SHA-256: 1dd50ae63f1ece2f796e1d754f30f12ea34a78befacf69c5f0ec3e62a34706d8
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 16376 bytes
SHA-256: 0b5448c6de0ed0f116d2c680d9cb6f47e90a51602807fce3603fd82f599d96d4
font_02_sfnt_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 10968 bytes
SHA-256: 223c0d15553a134b519c3154e8c05308e51cee84fb3028921c849bd130bc7a6a

Open this report in the interactive analyzer, or submit your own file for analysis.