Malicious PDF — malware analysis report

Static analysis result for SHA-256 45516aec7e2bbab4…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 03:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7f3273fdadf4390865fa14c6d3356aed SHA-1: 8ef39e8215b0027aedd83dbfe96566aa7ef07662 SHA-256: 45516aec7e2bbab4aea2d863ae3c55baf5d3a32cf556c4c796c6a56ed01d2e2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or appear to be on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://goodtraefarm.com/ckupload/files/xojifomi.pdf In PDF document text
    • http://mega-gold.com/userfiles/files/2597017572.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/73903460062.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/towav.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/86487566452.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/69130804433.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/50198347624.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/60768899619.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210914_78D3ACF0874A736B.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/woraburulovorusemaz.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/rusoxonulegomig.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615843e93ab9e---50253166745.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/norulisij.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/furivajop.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/93918492570.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/wufudoso.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/55502398688.pdfIn PDF document text
    • https://alpinashop.bg/files/48136277883.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/mugofejaluxusev.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vopikedajuvul.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615678406b32f---gukodupob.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/87213079490.pdfIn PDF document text
    • https://tl-systems.hu/files/files/zevilojebulituraxez.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/pewevidegarixupurujepomo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3aa8d0b9987a0629f392d9add66bd323/95189915550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=grand+floridian+pricesPDF 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_off0000b0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 16020 bytes
SHA-256: 9b0ef52b0f2a4a580a1f68a23217436ccfcfaa02275cf74c4ff7ca0806a23769
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 10552 bytes
SHA-256: 4a7007c000df7d36c0b047e1f3c598612fc8799511d62192abeb85f3c257a1c4

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