Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cd49f4b1d3c814…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 14:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b3242303988bad202ce0f285bf8f6baa SHA-1: 7bda24b5a2d86e38b481427f33979feab4a3afad SHA-256: f3cd49f4b1d3c814432b060cbe9f2f0ebe95bc1a6b93956ea24a98ad9d1647ce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.fashiongale.ro/userfiles/files/90717269809.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b390bbf5---liwitimudejum.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/69406087493.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/66356771892.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fodewurovozanejidit.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/zajugab.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0f0c1a2344619f34e125f53d1dbb82e3/6511323646.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/34907296352.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/59538101041.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/71399217510.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/vukewelopaxixilerobilowa.pdfIn PDF document text
    • https://diphong.com/uploads/jaginiredivuv.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109131649023392.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jaxefaxe.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/nawegutilupiv.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161316d119d9d8---naxagedixuzasijoje.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/57966970576.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/legubofifosexena.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/liwexenib.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/38hq3k8dso745cepv55h53vb51/fetovabozibumof.pdfIn PDF document text
    • https://greenways.at/userfiles/file/kapafaponuna.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/18889220150.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/53196194940.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/wazagobaxotam.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/43336684346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nba+2k16+androidPDF 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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 10348 bytes
SHA-256: bd5827dcb2866067a0173cfb5fe8158f41914f0dbc5e5a5ac932a9a7864fd85a
font_01_sfnt_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 16596 bytes
SHA-256: 02d6b96c095a77355a498ad05d851ea1b53bb16728ffe8bff354c29c731d28e4
font_02_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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