Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfaf29f7057adf0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 16:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61dc7f77e3d1a3b24919a12b18589eab SHA-1: 1bc6afb7e1beda234cdd9cb39ba5f0bf09f657b0 SHA-256: bcfaf29f7057adf03448a3f66b05ef1ca2b7c2fd608e901b605fd8b1a3d4b472
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a mix of compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+to+screen+capture+on+snapchat+without+them+knowing PDF link annotation
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fewuxuxotokomi.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/32740633488.pdfIn PDF document text
    • http://belloverde.net/emailer/file/jumewinadiwukuvezovukuweb.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2a316a38---7198515169.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_00_15_44_2140.pdfIn PDF document text
    • http://skolky.info/foto/images/file/33428340020.pdfIn PDF document text
    • https://terracell.info/images/file/10508027597.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/44088491400.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/59793592465.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/78329040272.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/24039563173.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/95552492999.pdfIn PDF document text
    • http://finchamauto.com/pics/wenezivepimevitulax.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/55747103956.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/64857815202.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/86964488226.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/23263132754.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/rasidoruwikoxerovi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5f87769---93977349738.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/55544861617.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/mimojisabefos.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/worixifepo.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/waxerugare.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/wijoxamu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rtbr7k52o5u53rhnh8uqgml657/1447950901.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 11044 bytes
SHA-256: 4c92058376d9d7ffc77c6f8ee4c8ac7d8baba66b1046f3261c1673ec7e722d86
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17964 bytes
SHA-256: a2b354968ca49a58eca485355cd6cba4aabff49d097dc6d2735a532d9c6fb57a
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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