Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4206d075d8e42f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 12:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a3cddadce1182152343bd3014db74e9 SHA-1: 9a657ef84e50d8de83bb745911dc1f6ceed1c6a4 SHA-256: be4206d075d8e42f6cf25b5d8ce04a010071b49ec9284bf882c8af873095165b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=new+nagpuri+song+2019+dj+remix+nonstop+download+mp4 PDF link annotation
    • https://acrgroup.nl/userfiles/file/64518363730.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cc5ef9aaee2487a4e23856267d6d51a9/50846925620.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/19766710897.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/27530296012.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/6270768398.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd5531d889---kozesemonaz.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109081831307709.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacffea6eb---87624066873.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/janalubij.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/54788801889.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/timupotiwexi.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/96575747508.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/34732386302.pdfIn PDF document text
    • https://dcimx.com/files/69229835827.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/21e634ec6228cd3a69f5e5f4206d0f9e/deremigenavegefufogo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb3d301c3---nadenaf.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210904114601_gfmgsk.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/genorilonori.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/pipafozosilusapasesetosuz.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/josutoxorofikolawaf.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091019150273.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/550ebf80e20d7587cdfdca2388de7023/najumanevidanozovezanutej.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/kufasofafugugipowix.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143860f519d6---komaxusuzopilemenava.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/95621220513.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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 11668 bytes
SHA-256: 63084cc3f0461eec02fd2351bc9f6a0e155e2cf5f80f7e6203e2a7025bfd70e3
font_01_sfnt_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 16544 bytes
SHA-256: 5ef7cae8bbcc506576932a256b5f1691505c60209173cdabacd50377daa34f80
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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