Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a54f7624c801a75…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 16:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed232ec7c9961a4d676604d840bfc4e7 SHA-1: a26418e652d864943da8425329b2796eaed3e368 SHA-256: 1a54f7624c801a75c76665b8c48f6610ab96083c8fc3d065df3d3ebc53d7610c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The primary attack pattern observed is the use of a link farm to distribute traffic across multiple potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cottingham-group.com/cufiles/files/19094774675.pdf In PDF document text
    • http://robertoantoniz.com/resources/original/file/48969756087.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/zapesezax.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ce0ofi1e8uqu1i8jvu4e0a4bh5/lofedabojunivor.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/22698459561.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62061caec---45242373756.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef0c202b80---suritiw.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc6a03500---wedowod.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b22fbe64ae55510a4ab9707678885c1c/zezazerozedelemutanovawox.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0teaftrqi166ijad8d40tm3n07/89587598286.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c37e2d4b1a7---piwujik.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lagameman.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/15abbf5d64d717dd810c3b6ebc277387/tadagavuzula.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094644819150---81529889457.pdfIn PDF document text
    • http://teraval.cz/res/file/fowakitogitixaxabixa.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/76279213447.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/k5ku9nbs71lm7h4q3diiqu8dgq/vavob.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b3e23708---12733374530.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5a6d60832a6bde9d804ca64931b0f068/91389502215.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/84656409368.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9b733a19---sivaverepuviralu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/62914272398.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/0vokq7rf8vvbaie1jsdfatufkl/rejowudosagasubisu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5ef580d421976506b7b925591132f1c3/86971505838.pdfIn PDF document text
    • https://guijek.com/userfiles/file/74287683889.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6e7b683b104729641f39700f9a900df5/44433290986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+case+for+deflationPDF 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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 10536 bytes
SHA-256: a6a8ce3b6fbb07aa2dc03041e72ddab923dab70ba3a818dfa722420a8759d036
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 16276 bytes
SHA-256: 702e45a062b970eaeee2c975f7cfb5f695a7231796438c6874d0518f46f43c45
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1