Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dd9b32334ccc72…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 09:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11108cb725fdda9673df8cf46e5bbb5e SHA-1: b6916a826c681273231ad158eb87400891c15ddb SHA-256: 14dd9b32334ccc72af8f550b2a15318e52a037b67e2ef168d9034c4ceac81e0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=download+mode+note+8 PDF link annotation
    • https://pinkrali.com/calisma2/files/uploads/voxokorikenivawaxovasu.pdfIn PDF document text
    • http://tzsunup.com/upload/51964192548.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/titupe.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/bemajiko.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/vodirixizawu.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/sexumaxo.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/komipilojoduzuzexevuvire.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/wogadujijikefejumapabo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5c172e0f6cb4baf6cb6addc9cd58a5be/nizuw.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/7153092737.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/87002623587.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134db5d301f5---tikizevaburotoketilu.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/rumulawusubo.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pikanidajufadepowat.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k7thj1srb1hgk7o663e4mkngbo/89680004057.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/58156687655.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100510502278.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/binuwewomujonuzabudobo.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/78975059276.pdfIn PDF document text
    • https://aildf.in/userfiles/file/kisabopavuneda.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/jalew.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/xujejebiwavewijapex.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/65897185641.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/79306279820.pdfIn PDF document text
    • http://marketingnews.fr/images/file/rubesupukunefa.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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 10344 bytes
SHA-256: d0e65bc4dc02b57c3ccc03cc02580a95c79238871038068a2e4e2ec9534cc17e
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 17696 bytes
SHA-256: b629aaa542b86d886b1bcb83f81e495a445beb62399c26dc5ccde4333e167070

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