Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e3b6c8f52e602c…

MALICIOUS

PDF

94.4 KB Created: 2021-08-10 13:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59d099ea767f8788b98d759882d175b6 SHA-1: 9464ebf307f70dc4d7d1c0bcdd23665afdc9847a SHA-256: 11e3b6c8f52e602cc21ae60fc913ee8e20ed1770fd666b7b9368851d97d20c57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://tasarimak.net/ckfinder/userfiles/files/10809138336.pdf In PDF document text
    • https://resortweeks.pro/userfiles/file/90151227713.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/jarakusosiwo.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/45449587610.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609312b818167---57619393865.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c04a4ac185---xinunanoderevodalij.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/fuwomelipapozagupibipu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cba4a7494202edbfc58df90f2671b034/53744704392.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6d46f43eedef82cb6e0f7d74b578795c/pezazovokapebapetaran.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0a83caaa---xebaxofurufarod.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2d04b15496c1d68bb31709853e49f9a7/kifaxoruwafebevagezog.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/55944816662.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/baralabababumelisu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/12248986596.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210802231306.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c8rjvl0bd0tdj4b34q4dqiekq/radugasaj.pdfIn PDF document text
    • http://naoshima-habitant.com/pezewaribirogafasesu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae415d83---duvewajujet.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28ff26e57---faser.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/mujagegurowinigemexiraxu.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/morufovexatilagenibu.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/sosunom.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/e943nao7sa9aitktl5ir5vga9q/1503232534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+long+en+route+to+stockx+for+authenticationPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 10988 bytes
SHA-256: 25b2c33155d1fbab006aba6b203686a819d1dabbf55364c56f45b7d6eb8d7c4f
font_02_sfnt_off000139c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 18912 bytes
SHA-256: d2564410988828836aee32cedff72fd81041226b9a116ac73331c194e2e86e22

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