Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f575a228961ba02…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 04:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c1a6381c0dbf88036228a010fb68f241 SHA-1: 3d6f4fa6c3221dc0eee0b1d0f8060fe89a3e2b20 SHA-256: 3f575a228961ba022846e768f4d03ad5a52fcd9e2bb437d5c676a76b01eeee62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://sambometal.com/dataroom/file/relef.pdf In PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/pafoxokekabegixutun.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/6107048217.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/50032454560.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/89235235867.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/giguviza.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/neribasugapugat.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413931bda49---35698829698.pdfIn PDF document text
    • https://termoformat.md/img/files/bakiri.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xelamigisezovodivavura.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/kebikusukulurerovanarof.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9f9daf10---gimipu.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/budimizoruxewawelozobuke.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/xutarirumeged.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16143e579e9686---vaxiso.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/nuxolikifij.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/wusuxikifiwuparofojanatu.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/10419579070.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/20491108785.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210913_085532.pdfIn PDF document text
    • https://davnosti.ru/upload/laluzelutorikizudegog.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/14540173801.pdfIn PDF document text
    • http://atya.eu/files/file/42430433170.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tiwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+city+mod+apk+2019PDF 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_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 11180 bytes
SHA-256: 0eec63a1fdaa76acf6a50d926906740ec21f1c706cd0a449580614a0b3ed1af9
font_01_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 20732 bytes
SHA-256: 04665d9c6ca8bc85cd345e03e3742bd7960ffaa6856cf9fd2b75fc217669e4bf
font_03_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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