Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0811d9d605829d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 05:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57078423ff937c6a2ae039d990b38826 SHA-1: 343e656bbe3f17f38516a72700532509f5444984 SHA-256: 0a0811d9d605829d35a93160a5c9bbf8069057f74549c3090bb6fd877eed9e31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple external URIs, including a link farm hosted on potentially compromised CMS uploads, indicates an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://butzbacher.turnpoint.jo/app/webroot/upload/files/migogibamanobajekezobufaj.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5a9d21a1b3be1db497bd38a4b0625994/xazedapamuxamovifimafeku.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/bewajopobewirofuzaleke.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/94507199022.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/xirozidelosalam.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/10356951496.pdfIn PDF document text
    • http://sayarbobinaj.com/file/5389170815.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/48609293777.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/67121399722.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/jegurupexu.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/83883226229.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/38139612032.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/ferogujelirapamamu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138331de929f---47338955628.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/302a1b3237b015c3bb47afe99b8ed045/menezidupipag.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/57615527792.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/nanit.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/nudajujabikofo.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/11263891879.pdfIn PDF document text
    • http://jarosi.hu/files/file/72771784289.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dawubigetixavavilivatuj.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902085015.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbc12c495---11908564017.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/rozazajivulifil.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/23748321386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+ladies+of+the+house+2014+full+moviePDF 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 18056 bytes
SHA-256: dc6492bdaf9808afa822d7340c52d8b51d77072abef7f8de9516995dce6d2893
font_01_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 10916 bytes
SHA-256: 95f4451c36aea2a26a4f7940c3c50dcb60e0b1479da672c84cce832bec3e06fc