Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7657341d84df9c5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 00:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 585b5c00c0e59dab2455e0759ab73a5a SHA-1: 3e49db78ae050c4748d784cffe6fedb1231c0c13 SHA-256: d7657341d84df9c5e77cca4250d51bc371ab2574e2b4a85989e5e653ee0c16de
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or potentially malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The primary attack pattern is to lure users into clicking these links, leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a0k09ujb7mh1p2a2kg68ga3643/korolowuzominuze.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607700d718546---lubaxum.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/82014767214.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da057a045---zezot.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/25722979597.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f68b8d8c---lozekuvelosowisu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4a8072006b5b731e2c785bdd591af00d/xuwufapogututi.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/lofejojugizokoketivi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b16451788fab86bb49aac1598c4cc586/61622510554.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/tewewuwofiludaja.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/nabafopabuvubapa.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sikokikagakeganokeper.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/82525311784.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/gonofibijereba.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/65230881683.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090450781b85---togodimiwelarajilimigefu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412477e103---xiduxituxane.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/028f33c3ca4680ba8dfa468e55d42fce/12384484128.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/lavapuwokogulexaledese.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/rufubutubuvajuketotogej.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/55312923482.pdfIn PDF document text
    • https://bataretak.com/img/files/file/13406926443.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d304afdda---wadovud.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18424959511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=astm+a193+b7m+pdfPDF 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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 19040 bytes
SHA-256: e33f87d3ea80f0e05391eec9dbd2834155a282bd90c01e816b6745641a057271
font_01_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 10628 bytes
SHA-256: ee36eeced14ea8e1a1f71f867f96a0594c58f401053b6df22f234d7e17c61b76
font_02_sfnt_off00012c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1