Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28e9c33e1f870a8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 16:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 356d4c483969a5233a50e6dfe7273703 SHA-1: 37e0ebc05f39a0967ad9d8341c274e0388cd2e6b SHA-256: d28e9c33e1f870a850fe5ba2417c5b6eab7242fd1aaa1ccda363649dbfc15c91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to external websites, several of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://enkaotomatikkapi.com/depo/sayfaresim/file/nanikekazisetawut.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/putekuxila.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/xozadotowirulazomi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f8hk2k8j3fe501sc79sg0aehj1/29189219923.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/5539924255.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818128a0d8c---81412122221.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0219055001625064199.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/j88dearevjk9a9cj0euvfpf49j/zikosojidajemikofetawi.pdfIn PDF document text
    • http://bdsductri.com/upload/files/54037497465.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607accb6eb3ff---16090667144.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d4c15f19---47469842755.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d619fb95694db9f4bebd3a0828329d2e/27088132382.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/56222092463.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/dilixirelorazutagupuvid.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f992fc7f264---nozinu.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/23779439141.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160812377b1f9d---35052424228.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c50a25f7---63860135627.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9576d5e05---fotumazawo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a04f707946c4b221fe302a1d39b98f05/babawetifekagipaloxaf.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/64ad3e85b9c78516c612d93a2f5ec8ce/jebekufinexek.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c67a2abbc3---rerufigamaterov.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/wixawufasepumawal.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/63778763951.pdfIn PDF document text
    • http://flexa.cz/docs/file/sasumozeneke.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6b6ed623---40764464145.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/75247039493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=verbal+ability+test+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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10488 bytes
SHA-256: 23e4273bdbeee1def5fb5b0fbae1cb45d4a0bccb62b2c053cfbf04eb39319f0b
font_01_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 17740 bytes
SHA-256: cb28bd148f93f043339ee195e3d5b6feb18a38db5157e67bc836e5b8ac353bdc
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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