Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c34ecdd01bee09…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 00:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 842930c0e8e3b666b9f3b43f9c97763b SHA-1: b9310cb35e3177d9217969b51551f66538a06505 SHA-256: 40c34ecdd01bee09dc1309c854d3aae63c48ea482eab01f9f21647fdb085d6d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, including one pointing to an IP address and others hosted on compromised CMS platforms and disposable domains. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://laborke.ru/uplcv?utm_term=minecraft+dungeons+download+for+android+free PDF link annotation
    • http://atem.sciara.eu/public/upload/file/bumavufobaxumozevinor.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/16395575625.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/67660915781.pdfIn PDF document text
    • http://sb-78.ru/files/file/netige.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kekevofidusipesisolewu.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/fosevotajiduposu.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/xoxozixikiriradi.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/jaxow.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/gizilawenaden.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/74484835546.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6s8uto50sji38n07dmf59ori59/71680047772.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/85240671374.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xumesot.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/jezifag.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e9488e66---94428341634.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/67650593654.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/tiwif.pdfPDF link annotation
    • https://bi-kiesabbau.de/cmsimple/images/file/6231661356.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b8thhn7mm2d2nlc23gd9veo296/11081823719.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1010bba2---karumugepabanas.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/mowomifim.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/gukerotusuvopuvapenexofif.pdfIn PDF document text
    • 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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 10832 bytes
SHA-256: 65410f3327d3fcd1871c01484e6640da651b6dbfb3b92d9cc4efd3d4ab139261
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 17884 bytes
SHA-256: 59688437d6eacb75c5e61ad3cb97d90d5c715982d83869290b1822a9a98ed45f

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