Malicious PDF — malware analysis report

Static analysis result for SHA-256 f430a0bb38295485…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 16:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68fb0fa7d6cd9b0d939b7e73749be8b9 SHA-1: 52e66988dbc37a2f27f451185bf92585d50cb0f3 SHA-256: f430a0bb382954859975c876f97aa3bbbed44966cc68a27afabfc8268736a74d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate it is likely part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=philippine+electrical+code+summary
    • https://dacinsara.ro/fckfiles/file/mumipajup.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a374335726e---69044920187.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bcmc2vqet31jgmjup12309ora2/29156475747.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/43d17b509caba2b4ac54a0ac24d6ab5a/gonate.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969de287c8d---sepaxoparunagivor.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9357b9157d40219c7df31d0a24fd3638/62450272464.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae266bc36aa---kolan.pdf
    • https://areicon.com/images/file/nilogeminelur.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aba949547dc79267f102251771ffbfb6/jazokokekun.pdf
    • https://samarpanbharat.org/trila/userfiles/file/tubafatoruxozixivexalij.pdf
    • https://stancijanegrin.com/UserFiles/files/9497941067.pdf
    • http://www.kickcommerce.com/userfiles/file/veremuvujekitifodezulusi.pdf
    • http://crystal-lamp.ru/uploads/files/witufolilakusirolafap.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/718778d6eebd576f8ade90dbdbbb8328/jerupelagowos.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c88df442---55577665786.pdf
    • http://rhondachem.com/d/files/potupevaboxapetutedir.pdf
    • http://kristenpell.com/userfiles/files/59789987087.pdf
    • http://madveras.com/ckfinder/userfiles/files/67635723808.pdf
    • http://smflow.in/admin/uploads/file/5843508773.pdf
    • http://pm-property.pl/userfiles/file/mejemegakagijakogotini.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/6529240320.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee86.bin
ecc2ed8007664d01592a261ac441d330985b65c4eecdd241f1a0600e3586b355
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 17344 bytes
font_01_sfnt_off00011bad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 16792 bytes
font_02_sfnt_off000133c4.bin
05c9f20bf0c384437fa8d768a889b3ed90417155018ffb4a383e6e38d879f0cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 10992 bytes