Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0524aacdd57a617…

MALICIOUS

PDF

80.7 KB Created: 2021-06-26 15:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fdc34bbd6e37fdf7f0a8bc469b10b2a7 SHA-1: 57159b50ad0196185d4188fed987871c59fd882f SHA-256: e0524aacdd57a617d00316e98942637c144e4f8c0070ec918540fac423670fd9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics indicate it functions as a link farm, directing users to compromised websites that host further malicious PDFs, potentially disguised as coupon codes or invoices. No scripts were extracted, but the overall structure and URL patterns suggest a phishing lure designed to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b190d28945a---60881301906.pdf In PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/pexamejatabagogumegu.pdfIn PDF document text
    • https://bonacorsi.it/file/tiraxemox.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jubalu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff30e656e---dimubawiwomepemo.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/17460722262.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/18164863836.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7468f576c6---81387914571.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d237efdc5b5---58803387842.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080bfe25da4b---retavoliguzeja.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/71504992610.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ddaca9df0b0d49c5061b80e5be6c1bd0/bodudusivisa.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98f699daf---16872561005.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/vazopawejejasu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/eb9n0o0hq9mn23df5rjs7s77g4/sapuferelupilote.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9vf9a521ad2n0qb831945hqfi2/keropa.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/20707419900.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b57740fa0---gafitakewetopokej.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dhu0o01eprtiuih83tugcsib62/rameripufoxukugaxutuwin.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b7fe3223---37768889668.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086f69871be3---sinokegofebujibekof.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/940341402.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/siwewufasitiwuredujopupi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/192210178008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=udemy+coupon+code+2020PDF 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_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 10472 bytes
SHA-256: 81366b4675f665fda4c438b2ed58a4383308b0ac7d97e968e02758167955d2bb
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 17228 bytes
SHA-256: bb76a4925453e9fe2a9a7494ceecc72c51babe7f693bfec7cd5ffd8e1d3212da