Malicious PDF — malware analysis report

Static analysis result for SHA-256 77af670ce38d139c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 10:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 128ccd5cd577ed0925f6825279eaafbe SHA-1: 3d11731f3bf2c5b6f1c3ca099b54520ad07f4eb2 SHA-256: 77af670ce38d139cb4a05a2e9cc7454277137cc7be7ae42ec3e765e6d07b6654
196 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests social engineering tactics, instructing users to execute commands, which is a common lure for phishing or malware delivery. The numerous embedded URLs, many pointing to compromised or disposable hosting, further support the phishing and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://sieuthimayphat.com/ckfinder/userfiles/files/fogevoler.pdf In PDF document text
    • http://ipsgroupjjn.org/userfiles/file/84625521200.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/sezowewisavefizitajugeve.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nisegetar.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/84518215371.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c563950d---53683896117.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tipopanaduk.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/66759167896.pdfIn PDF document text
    • https://braus.uz/images/shared/file/38691089643.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210908_193119.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tiderojodexebibudoxalodu.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/fepagijovi.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/42650007632.pdfIn PDF document text
    • https://granitnet.hu/editor_up/zukatoroguvup.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/95249158340.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/jebagunot.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87de94bf---73221375733.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/91815816834.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kgifkr95reo4fjtu00jbh6id8p/95016933607.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137849830f1d---tikozob.pdfIn PDF document text
    • http://nls.vn/upload/files/devage.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/2894173490.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/vapofafibufinuzaxukugem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+connect+android+to+smart+tv+wirelessPDF 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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10672 bytes
SHA-256: cabf5284b5f279cfefdf0e432cb6caa578371f456c1881500b23526c069c5eb9
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 17616 bytes
SHA-256: dc8bae8c441bcf59f0d414697987c08564d340fbbeda33b5c2dcc9787eb4b32d
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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