Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dc4f48427726e9…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 00:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 562178c8499d7f3aeaa05f8110ee9041 SHA-1: 78e0be33fec80a99953864559d45354d95ea3eb4 SHA-256: 18dc4f48427726e9064d1a9d4f39b53d772fc20382254ede6ef9b0625019dfe8
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 CMS upload directories or disposable hosting, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://erulingua.hu/uploads/content_files/files/leguragonadafadarusesidod.pdf In PDF document text
    • https://etonbio.com/newsLetters/images/file/70595001931.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/921e492f06f9d72b5286db1bf5823917/9015685736.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/salisokilategu.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/42008289741.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3abe79f60---rumududobaleboxeguzemumu.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/budisawufirumomefiruzod.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/guxifolowilalipek.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/lodiv.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/22162800758.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/68537141176.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/73a05cd8ee7fcb4d36dda66eb00c3e77/58457599749.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/8099291409.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/34403115079.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075baf83fa9b---lazopasoloruvezi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b95851339---11976191418.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f0b8589c12c88fd4f3d35f954fb27fff/bevegipowonosumenetugoza.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/zaropelorolaxefajabufu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b748fe4200e---87920373903.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bac4605320f413f941fc64ee182e0085/51384751468.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/71150586846.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sedt5s1ttlb8dpteucdr85b8hg/raxumerekuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=guia+ejercicios+plataforma+vibratoria+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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 20344 bytes
SHA-256: 8aa936b284fc44c1eb17b38ec02f1f3962422c88ca4ebd019731d8ffee2dd1a2
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 11152 bytes
SHA-256: e90529efcc34cbdbb0232ec4b813fdce1051838b59382eba3b48c5b61efdb749
font_02_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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