Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de56aa416c1f4aa…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 14:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a60c7170e16b2058cc68da030ad17a3a SHA-1: 08d73cb839d94632b28db8fe038a328804e231a0 SHA-256: 6de56aa416c1f4aa3e076a48206a1587a73e96fa9c428331336ade997cb367a3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to potentially compromised CMS upload storage and disposable hosting, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is intended to trick users into making a phone call, a common tactic in phishing and tech-support scams. While no scripts were extracted, the presence of numerous suspicious URLs and the callback lure strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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) or Microsoft license-boilerplate 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 http://amirafouad.com/uploaded_files/file/goletew.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/kosatilodinapifavudep.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c36cfd1ef44fb987139a547840be26f7/43747440022.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a773ccff9dcba7077152218fc292d7f/gokeluku.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/rejoditemitupak.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec64dca390---jidavajowagu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ijra4la235r1otbrl1mb3847d2/zijuledagokep.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/palidimelezimojelitanew.pdfIn PDF document text
    • http://nova-auto.com/upload/mokajemalij.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/warajimobine.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/63b2fe2b31ebf9d79f6a1c17e6b90083/6112053787.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/20177805010.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/9749365315.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/tilanavojazanefewotedolo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac651f5f035---furudidoporoxekoridosare.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/xegaku.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/02b8c6e18055f2cf6bb566b34369274e/koruredubani.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/zuwudebowepawelijeji.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb340cc0f5---59943159952.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4ce45a6586353b8f2d59c640132ba70/97013573387.pdfIn PDF document text
    • http://szpk.hu/_user/file/24107895519.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607435b711369---tokuwadulubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=anode+and+cathode+in+electrolytic+cellPDF 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_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 10392 bytes
SHA-256: 63d60bc3fdf1551378bb59565a89872853282db443293ed0131ee6d5a5455c8f
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16996 bytes
SHA-256: bc3deb5f75b4e6120677784458a2efc80c32c1257e8942597b67763d12462ad0
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1