Malicious PDF — malware analysis report

Static analysis result for SHA-256 5194ec138d179e64…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 03:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 693b9178157eb5cb42deac085902bce8 SHA-1: 9877aa71239e286358bb0ed4d66f11a94f72012c SHA-256: 5194ec138d179e64ab7efbdb4a0a927dc8bb5be6d1ba3f92145b845970bb50a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0dd90f12973b2d273510dfeec0340bdb/3531942821.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160814c15170a5---zoxavokakinetimivo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db476ce0fd---balasoxugarilonatin.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806121b8c12---25730946931.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ea7cf2df---18959992963.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zezugenagubewilof.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/84664612074.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/d8k13lb6rrj8ckniatr8s0q053/pelimupokaveruf.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/xasazaxomu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e11e64332---tezatusidomuzegumolomu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075154777797---90007018741.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xaxisebinazukadedew.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/89846290788.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2qsnnmsa1646j512tjk9f22rg5/73403104878.pdfIn PDF document text
    • http://ebus.cn/up_file/file/7740168224.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610767b82b45c---xijobevegoj.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610765295b989---dejajikurubalozil.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f229e71aea8---dudoluzoduvotikakig.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/90391792216.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kanavokikiliji.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94aa5a406---2818610789.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/51503559091.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609774775f97a---sedusometatofifazetat.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/95359156736.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/28016204413.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/27393926971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=list+of+antioxidant+foods+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA75 10272 bytes
SHA-256: 4446825aeae335b03e17b3d8bad733e96c3ad7b2b71814d6d3c95a1e8b6a5360
font_01_sfnt_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 18452 bytes
SHA-256: d29093eb26e452e060b0b60cf5ec607754c63769f381054bade4121ad6b88b5a
font_03_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 16588 bytes
SHA-256: 3a90c8469c5e2c828302ab02fb59231ed234707102a25c9747e98c510b102c12