Malicious PDF — malware analysis report

Static analysis result for SHA-256 4546a15d44a07e72…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 12:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db26fe24259c2b7aa9d918260031c2f1 SHA-1: 2fe0b349b01798994ea20f6057e9575cbcec5922 SHA-256: 4546a15d44a07e721a0a83674438d819f7b1ea6face4a829e8459670add2f159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress upload storage and other disposable hosting, characteristic of a link farm. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3106536e6---8186759447.pdf In PDF document text
    • http://prochem.vn/images/uploads/files/37540476025.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/figubosojaze.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/wesinunesowuvefelok.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/14525365635.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/eb76f93f0e9a28f9bd88a4f51372e9e8/jaxosonofulevepefasej.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/39542547516.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/99454411993.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/786o5sbktju3mbhbleari2c249/kinopeve.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/73509991885.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/sabomafa.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/73338965812.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/19274456105.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e8bbe442---vofutizep.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161300c59c1e64---98761571541.pdfIn PDF document text
    • http://newshop.jp/archive/file/kanuwavukojoli.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/14108862304.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/togokefefewakodosu.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/84692256851.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7la2hs429b7v7d6udl7jr2l031/45193676227.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/74017137750.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/69696320656.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/61117866422.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/99109022110.pdfIn PDF document text
    • https://artenika.pl/fck/file/tukegisarosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+can+cast+phone+to+laptopPDF 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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 10356 bytes
SHA-256: 9fa12f29db48d6dac229d7ce3b3f60544e59ffec3ee4191fe73b01adab3d78e5
font_01_sfnt_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 17328 bytes
SHA-256: 6a9d3207a3220268f5d95d69210ea280c56f033cef526aac3363a1ee162b2e77

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