Malicious PDF — malware analysis report

Static analysis result for SHA-256 56af937d5ab0071e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 23:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b092e8a9b4664e905bc5f39be922b461 SHA-1: 755cd6a114da9c883f08d5ba04605fb71ad02078 SHA-256: 56af937d5ab0071e5e1fd3064db1ee7c189c556577e59f7f408659815fc5cffe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to various PDF files hosted on compromised websites, suggesting a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://sitpchemcieszyn.pl/_sitpchem/file/furujoroxedexopexovoze.pdf In PDF document text
    • https://aedwea.com/upload/foto/zedonuwaxebokola.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/970060059a44284910d2ad48215bb1fa/rorazolixitazuwamesibeb.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ba0b91a4---45590077758.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/legigenaforiwupotelonik.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/46595301763.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/95289393636.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/70987100843.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/59109671604.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/xexekemovimajivofu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d40401aa0b---livokexiwapa.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/709746580586c34bdee40d7ad2f33689/61629810126.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f1231a603f2c77e5c6ec51199f2df674/zakereraxafakubawod.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e630c56a88---guzuwoxuxigisudikavim.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c4c1187949de65f5638044a2e764fdfb/21727007736.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/58301e0985984c34d1759ee6379537d4/14219522291.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/74079301002.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3731fde0---16393548653.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/weretimezuvugamisazakezi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da698255f5---savasiduvopadu.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/16686402067.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097485e7affa---76782574943.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3fba771f---52481685.pdfIn PDF document text
    • https://taperagi.com/contents//files/50200892611.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/gujimujeju.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/xetik.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5tkmqbk98dpb1hc78jumoffbn5/35438477224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=1st+year+physics+solved+numericals+chapter+2+pdfPDF 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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 11240 bytes
SHA-256: 75e2943a47eb95848730259e3e8d83e92b190d2aa1fa57e969b73b3d08c48bdf
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 17724 bytes
SHA-256: 8e31cfee3c2de0807df719a4e4b11f4676da3418a05f0a8532ea34294ca839e0

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