Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5acee42410dbd6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 11:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6185b0b5b21282cfc7f97f5fd61705c5 SHA-1: b22bbcaa9e955de24b8dfcefd5faa93b21d23c39 SHA-256: 8e5acee42410dbd631df9aa05c96291e977269c6813e1df88dedb38ce5dbd366
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure itself is the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b48d98122---renukavawowokina.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e2788b4b---51157493224.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/11474176370.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/56356431627.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8297bb8817edd744bf8ebde92478d874/libesifaxukejivibidaras.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tejelotuvurowemijewi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbb9061b7---kaneki.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/lilaxajeromemumabipuverub.pdfIn PDF document text
    • http://dgjst.com/upfile/file/49906765972.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/95119843248.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/39649263988.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a25a1891---35590472822.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/moduperediretotexonofemog.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/09fbcb3f2bab2bffa5c13f1346ba6a94/luvuziwadowagi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wisipe.pdfIn PDF document text
    • http://change-sexy.com/files/files/77730118404.pdfIn PDF document text
    • http://favourtec.com/attachment/file/4583638870.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/4642043663.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cb8084957c53cd6772d09bb1b1a9ce80/57298596828.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/tugazetojeroxage.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/fusomupowudozig.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/43507649105.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809e415109e---82287549229.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/86586963712.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592baab806---39580750508.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/jevebigixibarijanevul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kelvinator+stove+repair+manualPDF link annotation
    • 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_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 10572 bytes
SHA-256: 09a726bfcf0249202ab3a92296652105f14489f157135e97adbf81838b5e00d9
font_02_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 18548 bytes
SHA-256: 1318a6c3c65806834b9e3db09ed7317fdd9041bdb570aa62b9fab56f6607fac2

Open this report in the interactive analyzer, or submit your own file for analysis.