Malicious PDF — malware analysis report

Static analysis result for SHA-256 210f5657badb8666…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 02:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28a170e32738befd8ed67022b53d54af SHA-1: 2489752eab5503bf301d9eff1a91525fc110ed4e SHA-256: 210f5657badb866682504cb30acad1c79b2780a86765363c66f657cd1706d953
224 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, impersonating a cloud document service to trick users into interacting with malicious content. The 'ClickFix' heuristic indicates the document attempts to bypass security by instructing users to execute commands directly. While no scripts were explicitly extracted, the presence of multiple external URIs and the ML classifier's high confidence score suggest the PDF is designed to download and execute a second-stage payload, likely exploiting a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=where+is+the+downloaded+file+in+android PDF link annotation
    • http://cantinachitarra.it/userfiles/file/10768854152.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q67u1j3f76diho5p7rpr9uvh76/zibagebegapexojuvaveri.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/029a47ace3aab756c9f139c5574423e1/tixivetemonifo.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1571329813613d8241d56f2.pdfIn PDF document text
    • http://eva.am/files/718bfdb4e8dfc6fa.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/25025661463.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/lenof.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/25585797228.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131af2c52045---fepovi.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/fipawopefuworimifibojora.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/36411382860.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2f5de926---76066007477.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/pemaviwogujogok.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/matodiko.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613611efa83da---96621469851.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kefiguvuwivatitelumo.pdfIn PDF document text
    • http://torgoborud.org/images/file/govomesefafuwuzewoma.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/77102066233.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/72844615057.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21248107133.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/godalinivarimalape.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/rujazemurumekiwajozasad.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370823754aa---xewokivojoguxomekugalaxa.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/faf573db5de68560ae1cb486ca78b1e3/nulezutanezoxesorawex.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/45850100070.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tojijedetasijev.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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 10532 bytes
SHA-256: 5f372512bdbee8683976052c2f8d2ee786fadf178c23c133b658d4910ae6e77b
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 18700 bytes
SHA-256: 46f337ff88bfb1545b89d2e809c2e794b0c505c8666ab36dbe5fd830ad3df489
font_02_sfnt_off00013154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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