Malicious PDF — malware analysis report

Static analysis result for SHA-256 949c5c47dc96f358…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 17:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0d06ac184be605439756e4802319507 SHA-1: 7c11169ad907cde76a0bb06fc0cedcd8d706dd1d SHA-256: 949c5c47dc96f3588386b93ce842622f0849be39be77897a024e14464a259f1d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some of which are hosted on compromised CMS platforms. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=how+to+lock+a+pdf+document+from+editing PDF link annotation
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/mopozevenedetakoxolavam.pdfIn PDF document text
    • http://fruitvita.com/files/files/vijadarobejejunovavevu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wozefejovowagonugupazili.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/92887515848.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131404967308---69846257985.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/zekevapuwinuloxi.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/seronopexowepi.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/fubizedasew.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/80348753235.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jejelegolufitizofemapita.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326006632ac---54889709965.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/zedejobulujunekemumide.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/67492288664.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/nexezesufikifep.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/11463163686.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/24730582985.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/dugorosuzorowima.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/4933466927.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/doxejigepiv.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/68226365802.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/191f86fcf2da606f82690d61e4c93180/26955389688.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/22515466337.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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 17192 bytes
SHA-256: cb3698d38e252ecfea81b721502d91bc37c05cf815cc42a6aacd928c0e459831
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 11064 bytes
SHA-256: 4e29823f480b88a76e4a794e5ed0027b182d34e9222680c35c65ea748a2a67d1

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