Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f187970a3396df6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 14:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fb1f466fc84c5f20ce64ca8c1582bb1 SHA-1: 2022a92a76fb484d1353eefcb2b65735e3e32910 SHA-256: 4f187970a3396df6a674111b845bd03d23c7fd38bc0604300ada57084dfc9923
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the 'Download Button' heuristic further support the attack pattern of tricking users into clicking links that likely lead to malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=letter+alphabet+tracing+worksheets PDF link annotation
    • https://destockbaby.com/ckfinder/userfiles/files/68563315591.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/finenonitanegotu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/43479905492.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3kvrnt790itdp196o8kcjc4u51/jowiziwezekimujedura.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609e838e64a73---64280101338.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/89288293171.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8a8cf97d8d2dc9abf8dafc9132407c71/63564391050.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087e2904743c---32595151940.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/mubenemuwaneteted.pdfIn PDF document text
    • https://anfauglir.com/images/file/98558861315.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f1a88dd77b9c23afa7351346e99a283b/bolelemupadopefawubowogi.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/041547096906.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e72f3e4c3e---fafasisipizuturike.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/22631300881.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/nawavewugefex.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/25412216365.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b56a6d3b---29584544646.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/patunexalil.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210814_4147919472C9943F.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607119a6330a4---sulujixigutojap.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/fomadekop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/729ht1enolbs0549kojvtl10ec/34548227836.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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 17360 bytes
SHA-256: ebb54b086ae3a2534d499de20fe3e21230ed995359a0b8092950757ae6eb3a10
font_02_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 10928 bytes
SHA-256: 67398435f189775adf9248b530b606295795cf2edb526da08d45dd3230da4447

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