Malicious PDF — malware analysis report

Static analysis result for SHA-256 58270980bc1520e0…

MALICIOUS

PDF

86.4 KB Created: 2021-07-15 22:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba506f2b5cb25e9cfa6b60b64d2319f6 SHA-1: d667972f444fe2816ff1f78606e3e5cf2a0af99f SHA-256: 58270980bc1520e0d4650f4c3d930b14ceee431406fd9ceeb7f0f8bb496c128d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS uploads, suggesting it functions as a link farm to lure users to malicious sites. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://dentherapia.hu/files/file/63838515386.pdf In PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8a1361f42543d1d775c7078d2992304e/xarakipokadirizile.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0e10d017fb8ec40c12442ee0f50cae0b/20308063030.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb3383717---beronujelogugij.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a9a45156---bopisorilugag.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/fuvapidewaseleruwavakoru.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/mevimezas.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zenexisedozavezovu.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/24645468657.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/50161251832.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512234930964.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/85071879175.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/lu85392p2pbp8usund7tconnp0/wozijuwagutepuvin.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8381e9e14f---11198669235.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/58584929167.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/10273474288.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9tdpr6huuq2lan1p8puvv8abgc/74389561108.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/53260109839.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/91253196720.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3e0879e9b2f3f8aa2e8f592c56171276/dexamozamepifuniwonem.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160771817e2c33---98133355512.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pfm0tcdf2vg2rahbic3euok12i/44712273602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tunnel+cluster+nabothian+cystsPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/65590496519.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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 10644 bytes
SHA-256: a6a5acd6ea77014f838a3fd90bfcf62cdf7b9c72a584622a79da678813194360
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16060 bytes
SHA-256: eadcf2f213f815d54f44eaf629381cb7e3643552e9835ac44593f324b0778c33

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