Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d0c8bdc1af58a9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 20:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 740b19db4c1656fc74ef4c611293e808 SHA-1: 08b957dd261106d65aa699bd029f5b617ac62421 SHA-256: 67d0c8bdc1af58a991c10ab052b83839259fbd27f709a79ea31e5113d9549227
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The document's structure includes numerous links to external PDFs hosted on various domains, some of which point to compromised CMS upload storage. The primary attack vector appears to be a social engineering tactic to trick users into installing malicious browser extensions or updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://livermore.com/wysiwygfiles/file/wamixuka.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/marudukopomefedoxebawuvi.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/19504989634.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/63567677.pdfIn PDF document text
    • http://uchid.com/uploads/file/tifilaripitusor.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/pojubefodajame.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/figude.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rrraoha6l3dn4k8j7i35k0pph6/jojuxetulizilujo.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/tikokugeludete.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109100337274054.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/18158791283.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/43447316232.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dilunojevik.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/66236703618.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161484d10c8712---mufizosebonukofupalixemi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/78904599861.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61c525871---84241728055.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151432248473.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/15601881345.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zosajimelaje.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/koveb.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210904061052.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/23220820473.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/luxopakokugedez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gacha+life+7.0+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://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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 10356 bytes
SHA-256: 6620a9fd8e9a0a16e18c438847a652c2dc5aa7c2acab27d81f16e0885452f044
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 17716 bytes
SHA-256: 24110eab7ee5e1bd8ecb75fdfb281754dd6a39a3d1b84d6a88fe992a8868867c

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