Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55cafafc8ab2ee7…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 14:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c609fd435e9d8d8de95d4e6e77c1e14e SHA-1: e0b2c525cf389a4c4d84f07ef654cd2ec924106e SHA-256: e55cafafc8ab2ee73ccf9fd1670536dfb445f6a86f35525eed536dbd3e59e8b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves leveraging these links to deliver malicious content or phish for information.

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
  • 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://nomylo.ru/uplcv?utm_term=power+plant+instrumentation+interview+questions+pdf PDF link annotation
    • http://canoto.us/Images_upload/files/savesuvapekeg.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/30820958859.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vrom6fql11cpknhrv2fmqp4f28/36366913289.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210801111122.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/30772443146.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712d2a1f14---xoxosevabovogaw.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/jijadajalubibetev.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/21358321372.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210624091524.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/34679845524.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/67596983031.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/jirosokojilikugikakekisip.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a77db24ad---xarerefitugut.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/54881414080.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/klf7cpbs1ns00jkc06f2ktk5o0/13775783256.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/19680590066.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/xeragagikonetipogetesewe.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/54225955455.pdfIn PDF document text
    • http://wernitznigg.at/files/38682396608.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091021a12384---22965245579.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/tojegujonemojumizawakikur.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6bae35e8---93022109737.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/89778637539.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608691c027679---geberaxeguxega.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/77023338217.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/46677171909.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_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 11060 bytes
SHA-256: 2dd6baba8e5ceb03bca71964e72a98ed24d37fdef0df614b8d106a1606ee9e68
font_02_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 17440 bytes
SHA-256: 658ea72617da4e751cc4e57ff1c7cadf9d0c8029f68ef73fd1f0e9dd40b7ce91

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