Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7a0e3e9f49b4e1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 07:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb0a3328d00f829e99c8f16c717d0460 SHA-1: 1aa47f1d7531d5965076400926b44ff38da27120 SHA-256: 9d7a0e3e9f49b4e1f1633cee349ee03ed6138355e1577d96286a6721c42da3cc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classifiers also flagged it as malicious. The presence of numerous external URIs, many hosted on disposable domains or compromised CMS uploads, strongly suggests malicious intent.

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t0ql1rm645m66sit2g634q6li3/18764247474.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9903f5db5a05b1fa1a4798ab773a2e/garofox.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/rujijirinewamab.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/19b9cdfc12b7bccdb8add0145630bf10/suzurifita.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b3a139e24af5ce2dea50dbb372688c33/dipiruverovibidilegof.pdf
    • https://gw21.ch/uploads/userfiles/file/sepunobuj.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/fcda024396d72cb1590bf900e0d2039e/begizorenetawafenoranili.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/65c48ee475190578c3b3d714082d75f8/66992779183.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/migafadapadadukanumuneke.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d22dd218393db128ae667a3e03e86cad/75783618608.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56dd3e8bf---81924537145.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/55763e5daaab86fc0322bb14ba6e54a2/17781066432.pdf
    • https://soechi.net/userfiles/file/mazopulat.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cded5a20ead---82860775935.pdf
    • http://atraba-holding.com/userfiles/file/68031547819.pdf
    • http://benhvienlaptop.biz/userfiles/file/97965988169.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/38755853244.pdf
    • http://drapa-technika.cz/UserFiles/File/97070880978.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a62209834---betezalidagasiwuxexuxatil.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/kilawukubu.pdf
    • http://farmaciacogliate.it/userfiles/files/64386531132.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4f610e1644f1b402c1201220d0f7a7fd/fesibuxivodipanivo.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gabunezote.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+number+neighbor
    • 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_off0000ece9.bin
20d57209e63b675c5911bb1b9d15070ae714b106474a229fbf2714f0aebb0bc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 17636 bytes
font_01_sfnt_off00011af9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16792 bytes
font_02_sfnt_off00013310.bin
a2fba5d35a3abee4a202dd0c7d9996256b72f29a7f261d78c44dd836c56330aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 10744 bytes