Malicious PDF — malware analysis report

Static analysis result for SHA-256 8091bcc8c683d9c0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 17:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e1b519ef940237fdabd2ed7cd3b55eb SHA-1: f2fc8dd03e5e329c3f97370d5ac9ec53cd5fd946 SHA-256: 8091bcc8c683d9c0a562a4b7d294ef39547a8b0ada23d948ad36c208a15ea873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a large number of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://smidgel.ru/uplcv?utm_term=magic+tiles+3+hack+apk PDF link annotation
    • http://reguitti-engineering.it/userfiles/files/domujolizudesamo.pdfIn PDF document text
    • http://teraval.cz/res/file/rogitev.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/3353872166.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/49695528790.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614651c634933---wazexok.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/lodozemusixubikuget.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/6496915182.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/ramasorujamutekudas.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e271d2de9b1c29dc9c5351ef74b5b324/farabowevopekukisero.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/53066265712.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16148317bb05bf---xemesomapegizuno.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444d1c95af1---90003304154.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jasawuvo.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/godojezovifumemeles.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mojolakedaw.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/wikudidife.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ribopaduvaxam.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210919110214.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/41314867126.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/fafizegopijosofixepavene.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/34514803908.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/zanemuvegir.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/62668280075.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/29820836554.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/72727028057.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fadowija.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_off0000b7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E4 10584 bytes
SHA-256: 78fcaf964cd87508c8c5ba86d13980053b5a734c4889d158b501d7f773157fe2
font_01_sfnt_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 17816 bytes
SHA-256: f89e7294fdaf63e00b73ab0b1290ad601125d5af40b5d5ffd462de59c0e4e5ee
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1