Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1712ac153c7ff3…

MALICIOUS

PDF

107.0 KB Created: 2021-08-11 23:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2053da786c56ca1867395342dab2b0b5 SHA-1: 09debb349469a39a6813cc64dc0332cbd6b9fcb9 SHA-256: ca1712ac153c7ff3f77c690445d584d4276c4c39711513fc14f3a9de3002f388
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute malware or phish for credentials. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9537

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.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2c829a8c2715ac5622f649389f98512c/78609669518.pdf In PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/63628768213.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ee884370---tipomininanuxonevi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4127238ebebe39fc62f4e3e3271d03d5/vebabaluneveroronasev.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf17c385e6---lotipet.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/93771581513.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/dogofofan.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35331229889.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/kujakugaziwawoxatebida.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f0434603---bajivujugoderasusuwa.pdfIn PDF document text
    • http://hanifeugur.com/image/files/41256033279.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/81rjtk7tgdnfs2tc6nhbpqd00g/vosasodowekarezi.pdfIn PDF document text
    • https://yuss.it/file/46332210629.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/84398294446.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/99radkues1hrve2j6jn0kjsgl4/86505483054.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/jetove.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/16231377975.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/nigolakuvejixoponebagoter.pdfIn PDF document text
    • https://actorconseil.com/files/file/gaxafumopazijulizosegarik.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/rageduzep.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e0ada996---vajoxapixezuwawafilux.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609143007a224---fejof.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133d08901cb---galebitakujaxalilakonod.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5c49e15fbbbcc72f263a6ef15d5e5578/64432503258.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/65d2e39f9d842a56e3581762c1a705e4/15230238751.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/nimegegakelizisut.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098363e48079---pigopawotonugimitusejar.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jesifomofuwemitafalulet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ode+to+joy+2+ep+25+eng+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 16992 bytes
SHA-256: 12cd840f6d1468db8c014af70de4623ba2d6de5d0984222af607cb1a6d54d74c
font_02_sfnt_off0001526e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526E 10928 bytes
SHA-256: 05311a823c4192a57b6e25d4202ff2eb9f5ffd205718ad0e5332c1836e8d911c
font_03_sfnt_off00016b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9B 17992 bytes
SHA-256: da0504284c3a39680d4045a7ab974f502a4354ae4037271a700e26498d935d6e