Malicious PDF — malware analysis report

Static analysis result for SHA-256 5354f2b113af7ead…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 14:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4d93433e2fc6ba7d21955ed3465bcc9 SHA-1: 9d2d6b009f31bc54696ce941856ec586b9ed6d8c SHA-256: 5354f2b113af7ead5ccb7fcd26af3ee306ede769ce1f5d43ad041ad64183556d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://allytemp.ru/uplcv?utm_term=tda7377+datasheet+pdf PDF link annotation
    • http://mesterteto.hu/userfiles/file/sitog.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/11389660086.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/dba5f1cb746c9a6f31fa70deeaef9569/sujozu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/rupovufitowizejoveperevi.pdfIn PDF document text
    • https://fratellifurloni.it/file/ritonadekiwelu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d9f4751e27073261eecde986ddb9d1d9/nulib.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/90f14a057c161385c5046f8b10057449/juvovatepenapa.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/78509514091.pdfIn PDF document text
    • http://hotstamping.pl/files/file/53406479475.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/cr7kpa06jdtr7em3g7qsv8gl3p/38596020655.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/makojagukubujezidevobe.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32916540058.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/72697226112.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/guvowesevaxekemufam.pdfIn PDF document text
    • https://people11people.gr/uploads/File/bejowomevusavukarifina.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba35a4b291---dodevopuruvatikibuxom.pdfIn PDF document text
    • http://akademibt.com/resimler/files/sutapenemitajav.pdfIn PDF document text
    • https://petikdaun.com/contents//files/gowatolotadonudalirasoz.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/65223621367.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pumegalesenuzexi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810ef53f504---rosezuza.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/limezeva.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/510504b0f83dd59ea2c4ef046cc15edc/datowesilise.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c372198ba1---gadeletok.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/ruzomereg.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/19385419781.pdfIn 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://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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 10316 bytes
SHA-256: 163a39622ed025a97d8f63cdf0033c1515d4a17d561d8a1d1553019df312193f
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 20240 bytes
SHA-256: 4966c05f24a8803f7df91435aca93f80c72d0144c45a33ef417b3d78705b5694

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