Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92340df04aba350…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 18:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a0e6aad9f15adce7616a7e26a3025fa SHA-1: 920446c94b2bc50e0078839589f23ad9730e22ce SHA-256: b92340df04aba350628cc59703e2fe7a77f467d5b15e1d702fc92bfead1b81fd
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to download potentially malicious files or visit phishing pages, indicated by the 'utm_term' parameter in one of the URLs suggesting a lure for 'du recorder download apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://strap.sk/uploads/files/bowejoduxupebif.pdf In PDF document text
    • https://sluganarodu.org/userfiles/files/32873209999.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/32160209651.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/78201228471.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/7840664838.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/46330752770.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/acd26j0cv6aae67scc4c5ks0lg/jupulupudupudeto.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fdf5512f6ecea6b0b8e2023261ad94c4/7750741474.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde2e53cdc---25222401376.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/65657785579.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jujisamesorewe.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/36747849681.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/kolisu.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/6897328341.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/rafolovugavojinu.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/5538062974.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/foramupadal.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/soboz.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/wulegofitepepo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161380cbf2c809---favazajotamifebivotewaxar.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/sujipopizodikezidotopukag.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/23847200829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=du+recorder+download+apkPDF 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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 21660 bytes
SHA-256: 61a7b2d6320b0d475e5e019c09deb05f550511be414958ca397ee09401249eeb
font_02_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10428 bytes
SHA-256: f5363e2ee8de18aab79ee3ae839995f09fceb94d4927f757c6c6850def03f5fe