Malicious PDF — malware analysis report

Static analysis result for SHA-256 800a6e2c6aa764ae…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 23:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10f315954687ed95ec68acc1693e1ec7 SHA-1: fa22a856c40668508dca28233335952043eb3e1a SHA-256: 800a6e2c6aa764aea66b4bfdcb1c8133c8227d711a45e476f3648ca6cd862721
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or redirection attempt. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiorumeo.it/userfiles/files/81582591856.pdf In PDF document text
    • http://arebiatours.com/uploads/files/dowobomadafivoruto.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a21b0328---nutupolum.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd360316852---tugelewewov.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/zabitoduzegusujavagaza.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/pefazib.pdfIn PDF document text
    • http://abwva.com/uploads/files/zapevikewulez.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fqf6haqs9uh1c1kp5i06p9hho1/95520147511.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612a88aeb7771---17858383385.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f674be36e9---42892169021.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6d755dfccec3d569e0f1d4fd0169f197/lidojeme.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/82513137107.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/robolome.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/31443042458.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/jexer.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/fagofeliw.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/01eeba5dfce6449b95a1793db53e43c7/67034964498.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/nilapotumem.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a02046609---13356300045.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160988670031b9---mowuweb.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4e2fd2b2f24142d3e1e013506eae93f5/remubejikazugudewebujaf.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/33474437625.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/fonolatexolegitekizox.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/60041999393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=quadratic+function+in+standard+formPDF 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_off0000c702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 10616 bytes
SHA-256: b9b3b7d834e20ca9612a1cf9bf1a148610b2631535e9308bc4c500f9b588e313
font_02_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 16600 bytes
SHA-256: aef02885a841c682d0ff8cbdab140c5b8e7a36d594d694156cbb23ae07ab2f5f