Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e140630b5c19fe…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 02:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98175701c54a25716f800a5e34c92831 SHA-1: 41787c2c88c134630b668de107350e38f37ad7e4 SHA-256: f5e140630b5c19fe51b2c528bbab6c1897c37f599ea11954870f80d6de81f24a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of numerous links and the use of UTM parameters suggest an attempt to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6d7a7b2a7bedb2663b9cba478a00257d/5534732130.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/19747896981.pdfIn PDF document text
    • https://susta.vn/userfiles/file/11675460086.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/tivisoxar.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/pizusevonufisiroxirigat.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/vilokedikexovun.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/79308880438.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/baramupajisikixapiremara.pdfIn PDF document text
    • https://htchninc.com/d/files/kisejonoxawan.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/49004598318.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5qcn2enr954tsvfvl3qttar8jl/11930747954.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tuzavupolujusefomavox.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc58ead07---zisasobelu.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/58254340757.pdfIn PDF document text
    • https://x-software.cz/data/file/nifumofizegiketatopet.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/zavigavutewilit.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nd2b7bb48iuhh0srue0g28l9t3/vekozisu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/14787517970.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16100f0d3d3c53---geripubumizulutunun.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9f815fa2486e42152fb4a86101cb3fa5/63838926524.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/86634221005.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/42194139776.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c4ec094573f05cbc1d2e6bf78b512c2b/14051066419.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081576b19b16---leduripeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=complete+subject+and+predicate+worksheets+with+answersPDF 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_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 16032 bytes
SHA-256: 83d7084cd4fb5cab46a5965e858cbe978d83a0c10c2d8190b1fef96f48e2f34a
font_01_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 11360 bytes
SHA-256: 2c972a27f0db28b1bd4cafc8571ecb4888aadeb8217abb346ab120b254f660dc
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1