Malicious PDF — malware analysis report

Static analysis result for SHA-256 e391d90ce094d1c4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 13:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b082824149ecf77c225619e94f0b8a85 SHA-1: b926ef0aac6d42f493edd1b4e650f10bacceef0e SHA-256: e391d90ce094d1c4dc5b4840d8e4c6d4865ada09a7c087f5067f538236184a1e
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable or compromised domains, suggesting an attempt to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download' button lure reinforces the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://el-tall.pl/pics/file/juwubajasamuwekopugevemo.pdf In PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/93584916381.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/rorare.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134154342aee---poxidet.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/wonawedikok.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/jinevexefubudol.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fatipenuwufutija.pdfIn PDF document text
    • https://digireg.cn/upload/27598886735.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/53885089149.pdfIn PDF document text
    • https://trieurodata.ro/images/file/6798569264.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d26ebff7a7f6120b07c4753e77698323/godudexozovizoju.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180722251096.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/69146935804.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/48769375605.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/zapole.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614958a5a41e1---zuvevosadit.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/98717582464.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/66069335539.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zapikorejez.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/50497365379.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/luxagojagaminewazi.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/83848373767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=psiphon+vpn+for+android+free+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_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 18160 bytes
SHA-256: 604e798253e07b4636b4037feb50713103fc52c69f4ea67336ddebe46a7dfa48
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 10648 bytes
SHA-256: 9e76ef823e1d34e421d9e332e6daa3f7cb307a7b8a4d9ec134fda20d54192d37

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