Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4f8dcdc5652e75…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 16:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8fb374f27639a9c70c67d1ee1cf4648 SHA-1: a2d4a78ce7fd7e742b6dbcd347a1d072e37995f5 SHA-256: 1d4f8dcdc5652e75105047e4f929050fdeca0ca08745de5e663e92aa7b6429af
196 Risk Score

Malware Insights

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

The PDF contains a 'ClickFix' social engineering attack, instructing the user to press Win+R or paste a command into a terminal, which is a common method to bypass macro restrictions and execute malicious commands. Multiple heuristics indicate the PDF is a link farm pointing to various domains, some of which are compromised WordPress uploads, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://synerhu.ru/uplcv?utm_term=mod+menu+games+apk PDF link annotation
    • https://voyageaventurenepal.com/upload/files/witibufulabodijez.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/54579197851.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/xuruga.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/75878382202.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/rovidewexunizo.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/49652564299.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dae144e22ab315184398d0d9503320bd/31422300203.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/viwumejukidi.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vimewikosebudawil.pdfIn PDF document text
    • http://asustainable.com/global/file/67399853137.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109090301156413.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96ab18d95---neputenefifafusajedikotug.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/73181591938.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/boromax.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14b80f5bc---34388051792.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613044ed60d40---mopaz.pdfIn PDF document text
    • https://gdaniec.com/upload/files/84728713414.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/85407071711.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/48964127705.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/42462949799.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/72517659903.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/geninakaperaredozes.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/89776392298.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_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 10584 bytes
SHA-256: efa1f00ecfc91c6ad6b76c9fe191fb256f84876fed133fd7d62b181c67f1753c
font_02_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 17660 bytes
SHA-256: 8f9c33ca5709d1e8344a0e3379c2835237765ec61ca37812343cb5782d69430d

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