Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd1ea91054b021d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 12:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6209401fbbfd23c5acda9332738bef9 SHA-1: 370f36bbbc00bdfdb75b44de75cc22978c46c4fc SHA-256: abd1ea91054b021ddeccde4e3aaa7e64ce8467c47e2a1fb9185f033e57127ed5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm the malicious nature of the file, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=ppsspp+file+pokemon PDF link annotation
    • http://allivecoat.com/userData/board/file/xenekoju.pdfIn PDF document text
    • http://lejonhund.com/upload/ponin.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/zegivuba.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139918b11564---dibed.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/xudetes.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/pojuxonufijuxomoxa.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/13532533396.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/7042953252.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/41684452346.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ef078641---xatixurokelowasalegepidif.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/35241736834.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/23547015601.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/48315471069.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/60730923476.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/sutixatovosaveju.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/gomufozuwenijan.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/vuwawa.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/278d30e6f68ce0e5507d14bb7cbdf2cc/1844521533.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/dujojut.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/46555977391.pdfIn PDF document text
    • https://85097781.com/upload/files/wowutofukedop.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/lufemedonulilumemotejaxuw.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/boseta.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/446181564.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/59054882677.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 17592 bytes
SHA-256: 771221448718bc9df68be81178485b70c6364a8df1b139ccc312cfaa919ff982
font_01_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 10252 bytes
SHA-256: cab3b2358b25e6e9fa46c1521c2bf2d21a3da195a3412b081190521e2baf5ba9

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