Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb729f25df890ed4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 12:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6433cb001d4662546a64ad6abd6f2fb SHA-1: 3a98ca51210b8c4e4dcefef9bf4da5abe15760f0 SHA-256: bb729f25df890ed4e1fe40c88f26b00e21aabaacf61ed440381f6e5a505e1d7a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites, and others on disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to evade initial gateway scanning. No scripts were extracted, but the presence of multiple external links indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://poptheme.cn/uploadfile/files/20210902_023229.pdf In PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/27542898744.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/71614509359.pdfIn PDF document text
    • http://jaqalsports.com/files/file/68482873098.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zafufepiguluvedipipixol.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/5333219943.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/30709986383.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/digutikinapimibiropixa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613989460ee4f---bupesomek.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/57848154715.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8f9143ec---losat.pdfIn PDF document text
    • http://aven.su/userfiles/file/xezikewijivexejopivoxe.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/58764248434.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/tiwatozav.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/seker.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/837b265df9050b6bbb19a2d979d879b2/sevomomokavisotigemakurok.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/dawozaneraruripiperav.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210904035534.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/97841979243.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zivev.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/fupekebuvuturuwu.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/domekipifawudufajatona.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/pilig.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/67111341003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+v5+for+ppsspp+downloadPDF 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 21228 bytes
SHA-256: 081a1bec0dfaa3b38e92d12d8ee39b2a8a94cc33e236d043d5973a9ce56b5457
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10592 bytes
SHA-256: 57f00221272998894fd3c6c3c74c18452597ea1df4787f05f91e0698ebcd139f
font_02_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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