Malicious PDF — malware analysis report

Static analysis result for SHA-256 be814106af533e81…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 14:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 928add0226e6569531f0ca8cc78cd6ab SHA-1: 6c50a8169edf9eb94961a4d5180d52e245b60b63 SHA-256: be814106af533e81c5443f42264246232a74cf4825ac7ac7a4b6584e8546065e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, functioning as a link farm. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=special+codes+for+android PDF link annotation
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc1104ade9b03527b3e68c2ba355397d/17779688114.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/lotatanivijuki.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135053af1691---mumudufizurolisafapebaxam.pdfIn PDF document text
    • http://hanifeugur.com/image/files/84490676892.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/14453970473.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/61391171268.pdfIn PDF document text
    • http://klenderbio.com/upload/files/wodozifuve.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/48613987651.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109011126187333.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/40145710605.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/fijibojevanumo.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/kirimavuzumabazunozometul.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/tefan.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f9481454895bf4ee222057fad6cd8471/sixebejowisaji.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58651894105.pdfIn PDF document text
    • http://teakdeck.pl/files/file/21601061861.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c726bb608c---fivokimapamevote.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d2b335b0afce499c12b99dc29ca72e94/40002219293.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349291522d7---sulewikilumudixekoselupoz.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366019f3e0c---vawurinefopirufowiz.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/javuzi.pdfIn PDF document text
    • https://alpinashop.bg/files/gemov.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85463182719.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/98455830718.pdfIn PDF document text
    • 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 17952 bytes
SHA-256: fd60dade82916a8f68ac1a3a6700757d52e5b29104f946373c812da4aa7f87ec
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 10588 bytes
SHA-256: b1b0ed3c5f6962b8f6bdf3870665f89bec36436c92e82b226b5bd5df5bc32b37

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