Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d744fbb368b8f9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 10:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e78c55947e20857466585938ce96d1f9 SHA-1: ec8d8ca631a9ae7210945a478fd8a3ab6e34cba3 SHA-256: 71d744fbb368b8f975cdb690bd0579b5ce90b0bd2d12b2da0df35db8c41d4a87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=kannada+children%27s+stories+pdf PDF link annotation
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305b0f3edc5---jekobegogifelug.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/39136147803.pdfIn PDF document text
    • http://state-lithium.com/upload/files/gavemulideji.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161402b1648540---ratabemixenewagonadi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/45981286029.pdfIn PDF document text
    • https://campermagazine.tv/public/file/39490613642.pdfIn PDF document text
    • http://otczenacts.com/media/files/19311627097.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/jigilanaruj.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/6043258700.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/30043673713.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/63452762053.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/65755705859.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/59328403516.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/jedatolexasanopefafozobit.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/39000383960.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/56353862235.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/24771189816.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/vudolejuzufanozufokiziv.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/76449025901.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/78543925416.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tusole.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614530e8a6608---44030551093.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/81002520913.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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 17316 bytes
SHA-256: e4a1584c9a0bdef901dd23f3dbe77dff58deb5b0d002781a3614b1d05a56ddc6
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 10744 bytes
SHA-256: 534bed10ef49888cd1bafc1e2b41af90a861f88a042552504cf70a9ee3cd2bfb

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