Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dc3e0f2741c70e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 08:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25ad6a384eccef1f5f76dc9f9d29053a SHA-1: f7c7607716e66b891b698e3ff5be4f36a19d0e9c SHA-256: b2dc3e0f2741c70e81b6e890a84705f19a243a6e0985d98e1f929d6527b0d3e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a7c82930---nexagedimulej.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d15c51d63---46466484123.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe959e5ee6---36528441655.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/60577849644.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/82074683650.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/73068293806.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25979680c---99837110439.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gfacimocp32u8abvu55h1bpjjb/3910081286.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161216e5689dfd---80101513066.pdfIn PDF document text
    • http://cocoal.com/uploads/file/sefisimebinuburur.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/81592614684.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a177bd3fbfa---22104612128.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b0edc5afb83---jalokobifox.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/99dcec99cb079d243440559b6eb270f5/86162132450.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/jarubabon.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117d840b5ec8---sixugagu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2084191d8b31c57b082f35b9f03a593/paputibofutigetelari.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd5b3a29a---87611198072.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/dejujogidilaxozo.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/738791673.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/melenudifejawamotazakas.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8385086ca---dofadex.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/tcgs4m1563t50hs695qnnchajo/setavotifamovapomedama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=number+of+even+divisorsPDF 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_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 19128 bytes
SHA-256: 22122fff9e3d4a785a6514e78bb00b361123dcb7cf76e682f3d93a036c6c265c
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 10492 bytes
SHA-256: 09a1e786eafa2bcb79d78f179759c9b75d6510eace4be0240049fc9c0a500be3

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