Malicious PDF — malware analysis report

Static analysis result for SHA-256 788001ad09d87e68…

MALICIOUS

PDF

79.8 KB Created: 2021-07-06 21:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ca4cc640a48f1a799b88b5722d161f3 SHA-1: 5b6747ff63c11f81562265e510500d9134b32e67 SHA-256: 788001ad09d87e6884027ab1f2f45c2da479d1eb2e72d77c698085722d95fd81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=how+to+write+c+program+in+linux PDF link annotation
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fbrdtfththq2kupmkt187h12n7/lugamupu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8f4a38f1af41b941af91e903c804d301/jezivolakibifofopa.pdfIn PDF document text
    • http://indel.sk/userfiles/file/natitibidemuvigom.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/11815245955.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/46519354729.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/8769506428.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/1521435095.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a2abf5079db---48388016270.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801bddd6fdc---bugegazigogevadelig.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/3892707267.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a80cfb64---4579255689.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/865fabac91d7d89ecc976048a6ce86b5/50264982771.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075532e44fda---33646185450.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/15196995009.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vovitujemavasixe.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/35422275688.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ae23b7b---belaxiguzajamanovasifada.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/6270934896.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ulq2hlqntkd58tj9n5uq3h6j7e/tataf.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7462a8a32c35985469d56ba749dee7e8/5496900128.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a898abc5e6c---runibowogabivuroweguve.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/46925741687.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/64094632667.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/d4rgjqbrg41287o8416bvoemod/32915399329.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086575bbe265---29932967038.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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 10828 bytes
SHA-256: 23a2337b532e70dd64dda7515974a89882b65c69246314450c011c8c60abcb42
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 17392 bytes
SHA-256: 0e449085832ec9726fe5e3a6e7b474529ac90062f8933821333c121311d8feef