Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77009453838a41f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 06:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2d82584f50a16dc8f8b4c3053430ac3 SHA-1: bdaabfa7e636400047c66437f741b498fa8facd4 SHA-256: c77009453838a41fed3d2ff90bc2e26c58ca2426e391d26059a5a721992cf70b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to URLs that likely host further malicious content or phishing pages. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=change+outlook+password+on+phone PDF link annotation
    • http://rigassprotes.lv/uploadz/file/bapufifoxojidavigo.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/nelikerijovunedexav.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/19457730656.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/69559943244.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/denodufisusopuvidajev.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161380abc8d7a5---57965298119.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/rotigatezew.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/dajegimupumek.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/97811857518.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wadoretabazawifeganazo.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109060154597737.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/73520346085.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/kesodujiguxokobojadosi.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/52984527301.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/18830774509.pdfIn PDF document text
    • https://jjpremiers.com/files/vubakuf.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/pezeperolani.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/29786445846.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gapisanikutufosebenufid.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613461b87488d---xufivisug.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613056daed6c9---likolibijariru.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/xakusugulun.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/63783111645.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/tifatijoju.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/bofubiwizugalijolag.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_off0000cfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 10888 bytes
SHA-256: 492e0a7163eeefa1dc9ae6e7e8a1767c860bef338d6526945c4bec8a71910373
font_02_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 17720 bytes
SHA-256: caffec6533f1fd540caf28176bfa7398522328411721a56fb029b17694b7c793

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