Malicious PDF — malware analysis report

Static analysis result for SHA-256 35af1c016bbd7ba1…

MALICIOUS

PDF

84.1 KB Created: 2021-10-09 10:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0b5f58dcf53d86fb6fa1769f41d7b44f SHA-1: e2068b504c7095b3e24d567503907713e0145374 SHA-256: 35af1c016bbd7ba1ce4d8b3aafe61d1f558131eb603c65cb0a4bcce59c147bda
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to malicious sites, with a specific lure related to payment or bank details. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pistant.ru/uplcv?utm_term=19th+ave+farmers+market PDF link annotation
    • http://wuyioutdoor.com/userfiles/file/45972690409.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/jetaw.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/74955160958.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ba90ac68---dopakemarabitu.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/batolaluvolawix.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/15395543128.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/tolitodatuseruluxakoj.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e1b5d253e35f712ad6ea53d807a38bf1/sekidonavajafeligenuzuz.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/31507909047.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/37918685359.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/76360731603.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vawuvozu.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/90978815266.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/16090272516.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/vatopakut.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/85738426173.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/61726856695.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f48453b9ff---mawegefejaw.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/4262195396.pdfIn PDF document text
    • https://poker-fire.de/file/porikavowimunuxufevow.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jolonapefavofo.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/35682049041.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/maredixoxevesibipapafijij.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/fegasa.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/23609895901.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/2470769319.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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 10400 bytes
SHA-256: ef915b7d5b71c941f4fc0f4ed781271fab96501a2a3c4e3705fcc25c0c33575b
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 19876 bytes
SHA-256: ca27c705eccd0bf5569c62463e992b4bda220ace1e2a16e5f124e002251f2d17

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