Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa7cf0fddf00602…

MALICIOUS

PDF

86.7 KB Created: 2021-07-30 13:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f93f9f346ad0030f50a0ac21261625dd SHA-1: 7aec7e091a54ea357264f061b75f016a93762be3 SHA-256: 5aa7cf0fddf00602717668d186722c16939fb9fda5ab89a1924aa5574e53ff08
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/dimawimip.pdf In PDF document text
    • http://benly-carson.com/product/files/26364276459.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/98351457206.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/basemezefumonigufo.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/49615616490.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/6306000316.pdfIn PDF document text
    • http://industrialdevices.in/uploads/situlefolelajulobuf.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/70346658014.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/26089680433.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/temariduw.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6ea08964fbc79b1dec27055242f50e45/lizuzuwokumivaxoleze.pdfIn PDF document text
    • https://avenue102.com/uploads/file/29722338556.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/25245838364.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d060a39c991fb74d32f5600b63c7b720/85594845400.pdfIn PDF document text
    • http://vodova51-53.cz/files/54007038605.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160785241d7113---53217381798.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ae7ljkp2pimuer48jrul59a2o6/sovaxetu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080387987150---repetivobobusoxefuravuv.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c58328e6---rajov.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6rvhoh6cfbo8hbut1v1upc5lop/kanosituw.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/861d4012be559c94da608c167f718a44/rogozodopurumakapitofa.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/99555106674.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b53890da5---sozizogoxu.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/50850474489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+adjust+a+shimano+sis+rear+derailleurPDF 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_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 16180 bytes
SHA-256: fbe727640cb77a8e55c47e6aadc6e42833f0458756726d79db0e41d71289d05b
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13165 10820 bytes
SHA-256: eb47425670b213e0da78d35c2da7c4293dea9e19f245e0b00623f2f88bb2ac52

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