Malicious PDF — malware analysis report

Static analysis result for SHA-256 1084a0f4882a8163…

MALICIOUS

PDF

97.2 KB Created: 2021-06-30 05:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 376539a23fa898c36f6b3d8580680d06 SHA-1: 490fae6084ba8027844ac12870865c61b42139b9 SHA-256: 1084a0f4882a816370fbd2a7132de01bb76abc1397a25608a9f674c3df0126cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=instagram+story+template+business PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/02f6a5a60b07fdbb51d2f8011aeaf230/bimajekuputejopenegiwavo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/87065ceaf673d63ddf4c72dc773f5694/pemilelezenegawib.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6ec1c00ebe82c900def4f4b9a832678a/menuwojari.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/58226586855.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5dcf5d5bee9e784f5349b11ab703ccb2/87026799169.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/70529975685.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/bb3af39605f2a9e00048262ea20265d6/70068468716.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d289d293---laduwajodotusetivazedesa.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/xiwufovakatidu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/bopojetazevan.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1119d0185---68466086857.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/matigawimaragibur.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a561479f342---jazajura.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8c5p3r1qvqd6cel17qvgcv39p3/mulopofobad.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/jobojoke.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/xebojen.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4d5351de46733aad810ec2043d122f78/dabuxufoditun.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/646151aa18d2aeaa31cb20c4506be03b/bipirazanirosibajotet.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/pegol.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/49457586292.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608792ea820e7---wifef.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c13fa6a9820---87993250655.pdfIn PDF document text
    • http://faradbox.pl/files/file/wofoxewepowuximibela.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_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 17796 bytes
SHA-256: 3569e959a69281340c409fb5dd47fa57d775545ec6147dabf499374f462c35ba
font_02_sfnt_off00015ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA2 10900 bytes
SHA-256: 8aef1b7994375d7e7c6a3ddcf0f7c875d7b752f2306ee4045189e8358709a293

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