Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7974871dcd2d9b5…

MALICIOUS

PDF

79.7 KB Created: 2021-07-25 22:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0582875181565ca3ee21eef05e1c4bc4 SHA-1: f7417d153ab82e1f6d92dc9fc416281c19dea980 SHA-256: d7974871dcd2d9b59775c45ba0200e861a3e4adb07f3c6dc567a0b57d5318b90
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://digireg.org/upload/dunuludilinuxog.pdf In PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/muzanapejuf.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/51805720232.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/j5oarecjr08rhk0h9nvfpjabog/vuwixilolubibinadavudap.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fca5c4a4bcc---jitudumebodonerizoz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5ce5436f---sokapelajet.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160844f114715e---86473556378.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6f244522e5dc10b72c255b6ae02316ef/woxazalidogokaxokezoj.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/59497419394.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607afef9e7f52---dudinaxalevi.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/buwobemuwid.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/24125019127.pdfIn PDF document text
    • http://3sdent.com/upload/files/dunazelozonepujuragab.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/89563391616.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4d1a20dd878edc36437c4a3181510ad5/36321604768.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d63jid09p7kio5ots01umo0vr0/neveji.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d6d8d7fd24e9e315230a82df1b5a33e9/xazeled.pdfIn PDF document text
    • http://lg-palette.com/upload/files/kiladodikotifon.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/44031982836.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c478c903b---26257761363.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/44602ebfcf37826d4d65dbb04aafeab4/9377070333.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101248202230.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607123c373bac---82241824780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=exercises+on+future+perfect+tense+with+answersPDF 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_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 10804 bytes
SHA-256: 4f19b8e77aac1ecb31906a561caeee19a1f56ad7443b08dae428c6ff768245bf
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 17156 bytes
SHA-256: c70c87b2fcf8a8c15ddd1eba56ed4e6e8d8307ccfb7a81dd591f7e2924e9eb6f
font_02_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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