Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aa49ca374453ab…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 22:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8cdfed2c84b70ef2b4c1194d7d56226a SHA-1: 1a0506277a6d28909b7169eabe219844e5a47be7 SHA-256: c8aa49ca374453ab3b4ea329a3a4c4e79efdd130257d550a642fb02e64b6c94b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to numerous distinct hosts, many of which are hosted on disposable domains or compromised CMS upload storage. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://sporteambiente.it/ckfinder/userfiles/files/wewezinobepuvotu.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d83c23c26---47569836541.pdfIn PDF document text
    • https://aashianarealty.com/file/84334581505.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8t7tn4qkucceg0isjmqfo6i4d1/49416007686.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2ce3967f80e7d7ac0e28a711b9014eb6/24751987064.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/ruvijiwipexeje.pdfIn PDF document text
    • https://room12shio4.com/contents//files/nanoguxapuwurikuvanokujad.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16073e38a01b14---40378215998.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2a172b58d23d4675b7d3c529be42f8df/vilewe.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/12088359199.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wevozudawax.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/02baccc334d8d14fe9cc19a2fb82f519/6091286835.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/12070780350.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f53228e68b---logawema.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/9627115235.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/68635325202.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c422acf143a---nopuwutogorawifiwovutafew.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/70b63ffc938b7e01712b64ae91d57511/lunirosoxubisebe.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kutolo.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/64690225830.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zemolurepegopawisinaro.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/poxosudexeguvidanesufebur.pdfIn PDF document text
    • http://s-box.eu/upload/datoteke/lejejujomi.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/17122567566.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a1c2d73aa876ab446fe0c7028f40d60/kizorodipos.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/45020212539.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/kitubomivexudaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=planimetria+matura+zadania+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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 20004 bytes
SHA-256: 886a11052ae48d515504077d409d16a18b8dbc74b02bf8373d4e023dfd137654
font_02_sfnt_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 10532 bytes
SHA-256: c3e3c2b79d39d1c50b2d26054498d6dc6a45deaa6c309043290a176258be3ff8

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