Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5704d78b06a4f2…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 15:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab7a796df989e859b4e857d6c36bfbf1 SHA-1: 0fafe8a6d3f854e90e45ce1472aee159aefb2405 SHA-256: 5a5704d78b06a4f2ec4256ee31ea21946f33323095d56e726ae8f8af7784cec1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, including an image-only interface and numerous embedded URLs pointing to potentially compromised websites. The presence of embedded JavaScript and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to a malicious site for further exploitation. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=x+intercept+calculator+with+steps PDF link annotation
    • http://dafangtour.com/fckeditor/userimages/file/xasanamedubeduve.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/povowibavudilelu.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/wufakipaz.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/kolatekowixipokel.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cb86d2fd1755a18c30620549af73409b/moporadorikakaka.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161592e4fee032---ketagodisal.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/supazu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/44219458258.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/kugagitumabiveza.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/66692286308.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/zobabalegomubo.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/60819678271.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zuvawameladepewet.pdfIn PDF document text
    • http://lizhechem.com/upload/files/motulamapaxidigatix.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/63673772653.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/26833414169.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vonawosokuki.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/70067764389.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/44177223032.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/46914553029.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/29f132c2091a7af29f02848467f7201a/livepanodebilabilanupidog.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210913031540.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/bazawenokapu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f35d9ceb439170a7956f0f15d30522f/dokivofekadokewoka.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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 14344 bytes
SHA-256: 11d70566d2dae787c6f38096362ebcee5cbf8a101502d87753d0f24f4649dd07
font_01_sfnt_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10664 bytes
SHA-256: 1c3f67d30d87b14e56a4c1cbd7a7c1f2d6ed28ccaaf63c8590863db9308178d8
font_02_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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