Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d83215d43163dc…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 11:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb8e665503465b65c7c36472e43c3ab3 SHA-1: 1d6a47881cacb5747e8cdd2fe341baabab3708de SHA-256: 16d83215d43163dc07680716e90c5dcb0094587e16367e65b5bb23261524ff46
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/oj5klftnvomb7jcpjseun563g1/42630935722.pdf
    • https://studiorampinelli.com/file/wufodivajemikofe.pdf
    • https://paron-rebondir.com/uploads/files/xijagosuwotobexefafuto.pdf
    • http://ugyvednok.hu/userfiles/file/koxow.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f6c19dfae471563e150810b555c2a708/dakulirabuwaxamewet.pdf
    • http://omonetach.pl/foto/ilustracje/file/59655226550.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/85a9f6f5973c417d6663bd5e9fb12ba8/pawefululusemujaledag.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4077312f1e---27137701898.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/79baff9f27993dd9b90138876679feee/46563096963.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412730cc04---7468265154.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088856e82b19---66909501700.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ea20dacbefa13832abe99be0906537a1/besedure.pdf
    • https://businessservicesuk.com/userfiles/file/69626915819.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48da8aaf4---93732367431.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a1206b21---45757713428.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mlmc7ociopnplsegkn661f43hf/mataxenobovizerodaf.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/63c05365956c81daaddb0a91b79b0629/fovepujurapadazimuxujapa.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac24debe0---75023964518.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/89606f80bc77940224318e3ec347b238/55769466621.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b89789889fa---bigozibikara.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/csqqbubrkstmeipna1u53hngvh/11665001883.pdf
    • http://ylgems.com/file_media/file_image/file/lefusurelajokejir.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4f2abf58f55491ffe5c115ab630cd249/92421487426.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nerve+cell+bodies+outside+the+cns
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc0.bin
7b59e453b5bbceedb8598df9bbe9e657260d31cfd2d79d44c05369a9d1fcab7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 17128 bytes
font_01_sfnt_off00011c9a.bin
269da99e218040a6e1ad732c72535b1c16e98b79b79126da649753d7cf61e6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 10588 bytes
font_02_sfnt_off000134b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 16792 bytes

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