Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb114371b874b32a…

MALICIOUS

PDF

109.0 KB Created: 2021-09-06 17:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 797a5d38fa518eab36444caba89820ce SHA-1: 9d1943b3941884bffcfeb995d50cf789588fada1 SHA-256: cb114371b874b32a19512167c3086527ff3f481aedfc230080b5fbcf5e346682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9e1fba82ec5413c9cedd48a712f94bcb/79687270176.pdf In PDF document text
    • https://dgssu.com/upfolder/e/files/20210815135421.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/95120227393.pdfIn PDF document text
    • http://artospace.com/pics/file/juxanujatokalizatukogus.pdfIn PDF document text
    • https://birudongker.com/contents//files/64049541930.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/vunuluretujavoku.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ce598ea3---leserurotetu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/32692652305.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8b6f73ecc---82517625649.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f461be2d477---21419912329.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/17377482968.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4mkdou115en9nmbd7gh1torqq1/79205965255.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/32796638714.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/71378427839.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0fd6c16a7---suritiravu.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/59815433193.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/6d12b300657aab45cf955db2d02740a5/97341582845.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100aef8ad877---bozivobefiwirolorezifo.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/tetaguboloko.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/67961571273.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nujozodevugejidozekutiki.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/wimepopuzifuzipa.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dipumexunetifogibigusuvin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=heathers+the+musical+script+pdf+freePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD9 20300 bytes
SHA-256: 08605c3eaa0a286ad0e1ad1981ddc4b8c33f9ef611b3be73dd3c1b70809e340c
font_01_sfnt_off00017581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17581 10752 bytes
SHA-256: 4be6a785561ac1a50a0cc540aaf238ae93d7e8f78d461c835ab387d1f1b2920c
font_02_sfnt_off00018e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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