Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda07a0a35f811b6…

MALICIOUS

PDF

114.7 KB Created: 2021-08-03 14:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd1e85fc8c8142d9145213775b7a0fc6 SHA-1: b7fae7e8e408a7341217ae783882370a11c85193 SHA-256: dda07a0a35f811b6f03349a4c4844eb9b862c5efcc48b85fc9ec195df3c43164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://pixomot.ru/uplcv?utm_term=space+flight+simulator+full+version+ios PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7ef4e6c8---nabumujenifojosa.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/48083893549.pdfIn PDF document text
    • https://equinox-e.com/upload/files/kikalosuxumevajala.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ffa35a6601a50e426199abc44f436253/9208933872.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/nisezusetijamuzobisusebaj.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/bidekotujonabujinu.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210524013559.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dabf72e4a---88295396706.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/jifozidexuwexazawapej.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e419a7e8bf---vefasunudi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082445b6dbe4---kesovites.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/20826134698.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/15c8988804c0a0f35c53ef39785f42d4/kixolomilate.pdfIn PDF document text
    • https://tavio.ru/files/file/davaxis.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a57a1d44---zinizejumudiregevarupareb.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/53343201667.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/38835595511.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cee1bac5ded8e775565f1c3698a9e345/bapojomif.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f0a79744---pugezuwagokabenofakosalo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/ranebezupunugedalej.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab9b62776---zugudoxodejewatixeturiru.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021724750426181.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6522a90087---xukelulonupisunu.pdfIn PDF document text
    • http://rc-modeller.se/images/file///25201608411.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 3752 bytes
SHA-256: 157eb5b4050c796ebed747485e65d48fc459d45ad98abfbd7b08f503ea6ae8f0
font_01_sfnt_off00015b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9B 17956 bytes
SHA-256: 2fa4c93dce76c52de00b82b40a0f13c71303258eef73a89ab7ff1ce452af2e61
font_02_sfnt_off00018a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A30 11168 bytes
SHA-256: fffc8e1bc4730bbeffa6183e4afcee4103596f45d8c134b476eb599213f5b024
font_03_sfnt_off0001a423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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