Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e34734d8c795e0f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 10:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 385dfb0c500ea190b02ce23fac29aa89 SHA-1: c012f56da83181177833a89fc92133117564b68e SHA-256: 1e34734d8c795e0fb3d83c53eb71d11699e2c018fca6112d5d85253c6f4586ac
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 WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=clr+through+c%23+pdf PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101068c5e133---80537124012.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/97047482042.pdfIn PDF document text
    • http://badgerhillfarm.uk/94902731167.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/55e79790015eb6b7e95eace71e6c5034/54571641001.pdfIn PDF document text
    • https://longhoang.vn/upload/files/riwazup.pdfIn PDF document text
    • https://securitydm.com/slicice/file/91016746837.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/juvugizi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c7193439---87615814870.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/wevirisupulojakivafuna.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/bibizasitod.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99687187366.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kau3c1bhr39irg0vejtjofclo5/worulexexas.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/giwij.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/51978548241.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/27621730034.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/jomomavaruwelijaganefiril.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/41acb1749d39db3b48cef144a1fa3eda/68583830805.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5ac3101d8---nokanuroropojonulenis.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/76897141900.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/74499726058.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791695533f1---vowimetilojufop.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611533ae6b6db---mijawedigo.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/japuliwinekivomi.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/gojegowog.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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 9980 bytes
SHA-256: 902ee11a34ca684b83898bde5789657d1de8b08b31c27e408396b9781fae8f8a
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 17336 bytes
SHA-256: 5df3f2eed3bac05bfa70a22b409bb8ed92be8c48e289d8da1c6b9de7d528410e
font_02_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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