Malicious PDF — malware analysis report

Static analysis result for SHA-256 16489221997fba2e…

MALICIOUS

PDF

172.2 KB Created: 2021-06-09 07:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2306d5222093ebd416a8a47fb47d8709 SHA-1: d0fd91809975ddf39a4d09c90e40ba14723f6d28 SHA-256: 16489221997fba2e13e4da7d5e927ef330fbde792dadc7b8346d8bcd89f1700f
164 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=young+naruto+manga PDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b250c81d5534f7f899c58413666e7643/58407919083.pdfIn PDF document text
    • http://mopron.ru/upload/files/kefodaxabefugifokinugiwin.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/23c65b2764e1fce95ad7692bef4efa31/jepazogodurozolim.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dabae65e8---sasuweko.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/nowefetejagikirudibax.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/mabokata.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/mabajorumisaji.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505131928668853.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/34124700177.pdfIn PDF document text
    • http://ridendo.cz/files/file/50521713486.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866830a3888---tujodojuj.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f684aebb58b17dae90eb538fd7e06fb4/51673518214.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/83671634e84faae0cec09e4d416f0a01/22397586191.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/faa642017c5539726dab4c1e9bb89595/35664708055.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160725065ea4ca---73856095596.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf9786455---99994156512.pdfIn PDF document text
    • http://plncse.hu/php_data/file/76529387970.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1e66aa1a13830b2c01c0b5e71b766e65/zafitetokagovovisobowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001a774.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A774 62620 bytes
SHA-256: 1cab5d000bc11c1c607a521d9e8b1e915b15ab817a7ab0360a1369d2e21579e1
font_01_sfnt_off0002673a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2673A 4756 bytes
SHA-256: 6d9d626001cb937e61ba8ac09e9c00c68e3151c8270f3f45e73ba2e857eead15
font_02_sfnt_off00027758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27758 12672 bytes
SHA-256: c02566c626f347ea7b072abb5b94074c4a42a78a25458bbbe0a4f486ad5a0006

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