Malicious PDF — malware analysis report

Static analysis result for SHA-256 37af8d30d588a5ca…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 07:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 002245d659beb2ba16dd4808b42b4906 SHA-1: 2ef9c5e2169c0054faee0549d8e549ebb118e02d SHA-256: 37af8d30d588a5caeae653fdaf9b0363eacd0c721d03729384e42c8d83e35c11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://files.ibiza-ferien.de/file/losanunabalirijegipilexed.pdf In PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607292ea1fc45---8578939457.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/45628823010.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/84375378139.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kifimen.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160983b48d0ddb---50698470127.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gs8hh8ushh7q18dm6j4v1efjq1/95357555757.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/zavukamuti.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfabf2ea6a---fajiwijotuwovazumurozoz.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/nomawujapevedekitiribexaj.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b0622f2c---tojenurogom.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/73465976352.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/suxun.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93830ad0e6---xobovegevamodojeraru.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/73047882580.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/76511589815.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21dcb36344---girugosonuluvom.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/zunojepipatusiziwaku.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087446936f31---93546540179.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3q5g21qlikb57ciqq6infvvsc3/newejifo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160942b08a73ba---zojilegogimalufutosasow.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/64902569893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ak+datta+embryology+pdf+downloadPDF 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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 16580 bytes
SHA-256: 5924b3b051abc0a9a37f462ecc0549ed527b6637882bd1a405ea3a67ba3151cf
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 10992 bytes
SHA-256: 93bf452040c4ea9de2ab3c20fcb39db41cd35de2162de57d467d2b956928824c
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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