Malicious PDF — malware analysis report

Static analysis result for SHA-256 836195b68be0ad24…

MALICIOUS

PDF

144.3 KB Created: 2021-08-12 21:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe7db923b78630b338d4e379de081326 SHA-1: cf87af9ac451cccd56140938ce8f51663527057e SHA-256: 836195b68be0ad248cd1869b4c38e2f799bc8daa8d9c41a3368eba3ec51ab6fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wastran.ru/uplcv?utm_term=2019+scouts+bsa+troop+leader+guidebook+volume+1+pdf PDF link annotation
    • http://inlygiaylynhua.com/upload/files/61748573078.pdfIn PDF document text
    • https://led7.ru/file/tikar.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738e627d62e---latuwuwi.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/51151813.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/bcc91a47719d302d6b0ebc1b50e01e4d/jasonulesikox.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/94835464871.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d9788208---mezegiroderoki.pdfIn PDF document text
    • http://caramelitos.sk/files/putofukojuzateju.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/o6f9spfflrauen5e580tso3mig/zofor.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/mopasisivibuxirikogonuz.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/15761434640.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/80235678056.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec7571b05---giponinitukowofuv.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/097cc396aee2d6b6379f4c40c23efed9/7551115349.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d272361e---pelunuxizejitatepa.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/vadurikosuxideso.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8d2igkakqlb02u7g2k4hapq2bu/33323538637.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2aad7e5e872e9196475c9086dcbcc482/17017859920.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27a112eee---90944907225.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizenokipigavomitu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jknc3rflr52hsuveqp7qks3ajt/83583624182.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0dbbc2c91---5755539766.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_off0001cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEE4 11624 bytes
SHA-256: aa270fdf617219128a0209e9e7d4f224caa02e88c4f72a6ef62cde9246ebbe05
font_01_sfnt_off0001ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2024D 18108 bytes
SHA-256: 1452ea81134a0a465db8f533b7dc9a0d06bfbe17708029b97ce6cdc1d9df6b39

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