Malicious PDF — malware analysis report

Static analysis result for SHA-256 843ef1747e43622f…

MALICIOUS

PDF

100.1 KB Created: 2021-08-01 18:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a1a0075c3fd161a11a5cfa9e0c79235 SHA-1: a12ce9e1b6942e09d1ba9995bf179d6c083ade66 SHA-256: 843ef1747e43622f6c2f19af74dcc97d37a0837fc2a9ac80ef78d5fcf16af4d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ewastexperts.com/userfiles/files/88453931378.pdf In PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/zadiwonesekubosexezoxeme.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/fabarokafibena.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/dagutuxovunozivinufiv.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b6607034---nosuxefemanosilal.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbebaf82975---lobelisikijewewo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b271b123b---vebapubonudarezemofu.pdfIn PDF document text
    • http://teplospectr.ru/images/files/mawulukonativoper.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/41543925960.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/punufedinukokobo.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/desezubizupupuboti.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc87129baa---34394397360.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/sefigorotixuguwimurobel.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609546ca43913---jutigiwovigekilawakeb.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e820c824c19---48736225866.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c24299a77644e9d2ebb2636dced04e95/legurudesiza.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/joxavumaxul.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/56508947ad21cbda917d05ca2f00243e/kitipe.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/25731816813.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/98148015104.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ad36ba929---22384885029.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e482afed83fd8b5ef527a8abaab818e7/fiwugilugax.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/56385560758.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/11560925875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=j%27apprends+%C3%A0+lire+avec+daniel+et+val%C3%A9rie+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_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 18492 bytes
SHA-256: 4418652a107f61979868b61119b02a3dc87339f7865abce3c072a6bbf6118cfb
font_01_sfnt_off00014e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A4 10920 bytes
SHA-256: 7ef5edaf69a6cbb8e1c144a8cd929538d27c3c5eb490d8cefe22239f13034219

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