Malicious PDF — malware analysis report

Static analysis result for SHA-256 5733c2229b94ffd7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 08:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56203f9455023cdee59ccfd423f72bfa SHA-1: 67aa7d9b8d20fa8141244a6790514e18177c6be6 SHA-256: 5733c2229b94ffd76228b2bf0329ad4e3b5fe238d9dc51ee5dd5dab7d94e332b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports the malicious intent, likely to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://octvads.site/js/ckfinder/userfiles/files/kikizagimejoxuvitojuzene.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d20de17a---27618131881.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pomikemaveno.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/25217999123.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/4991653779.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/subolemaxutodev.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/duzigebuwiwe.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/65oofiugqu10uj8f4os3hpog8s/rajisanaz.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d5e5d207---72351944357.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/83480841613.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/48254373072.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltj2tds944p5doe25vphejjvcb/87928534061.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/moviduxuvoboxugibavu.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/gujakawawetejux.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/zukukonud.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fla09r5u446q0kl6vti3gnb7h7/zigolokebotezogax.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/binunenurinu.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/60530233154.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/30565570843.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91da4fa08---27845177348.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/fuwufomoridakopegebever.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb48179c39---bemixaregolig.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/382c4c0bf0a4d8944f1087700981c979/90422981085.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/483bfe4d929f0b5831106806ae3e6de2/39179047141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=converter+pdf+em+imagem+iphonePDF 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 10828 bytes
SHA-256: 93874d193b7cb1209f35b13356a6ef4852bf8493ce09eb2972f3f4e46fd6310f
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 19468 bytes
SHA-256: 9511f9cd5eb889195f2d0da5aee3957d71907a2a4791ee04e68e4cdcdd8cd78e
font_02_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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