Malicious PDF — malware analysis report

Static analysis result for SHA-256 2921f3a90541829a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 20:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c686b05c2275f6f4ff5e0e956648f2c SHA-1: 58adbf22e34f34310b8a2ef06426d8e546f4607f SHA-256: 2921f3a90541829aa3001dbb7a5bb237db44c8226bc08bcb8e4ab8a3e2e161b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=leitz+phone+1+price+in+india PDF link annotation
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210901130932617389greu5h.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a53ea3ddca30ec2b2c5d6b405b98bdf9/58697564517.pdfIn PDF document text
    • https://isleo.com/i_photos/file/geruvuzuretijo.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/levajoravin.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///86471124762.pdfIn PDF document text
    • https://tsolisp.com/files/file/81655185710.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69330768197.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/89655107259.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/38790729505.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/dusolulilef.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/66892330761.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/73523877262.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e2ac7f4f5d341bf73d41f0ce5ef2d5ce/fegeleberigud.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/41602369851.pdfIn PDF document text
    • http://iltorg.ru/upload/file/zoduvokesudotoxuboxixix.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/810b810f0fedbd6f31c6ab7d37c9ac66/50000947102.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/pobojatukekovurofowunudo.pdfIn PDF document text
    • http://kbchina.de/upload/43103315560.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/lirusij.pdfIn PDF document text
    • http://teplospectr.ru/images/files/remujolamuvovilumejokaja.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/19623782076.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/37101334373.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/5319609132.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/84011498782.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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 10468 bytes
SHA-256: 4caec4bac8ba3f724832ef6c5b164f664b72bb1ed5eaf19a61f129a60cb2644e
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 19196 bytes
SHA-256: 134f4c81f9948bf52a97e7ec8659c65c9fe5c897b12a1c3a957eac8ae0da0889

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