Malicious PDF — malware analysis report

Static analysis result for SHA-256 163f9ce01232ef70…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 23:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73ffba865d10da74fb829c05fa7df729 SHA-1: 18b2507569bd8d4f8ace17f55ef7f70cd60d337c SHA-256: 163f9ce01232ef70c0bafe3c40bee0d56b81433c6bd7776a0039b2c723cc0039
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=watch+midsommar+putlocker PDF link annotation
    • http://vetsnab32.ru/userfiles/file/tataliwuwokagarunodimuw.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/fekoselaledalokixe.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/68298677676.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/mebinanojilex.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/14123782890.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/ramunexevarovoromirusile.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/13256432298.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bc29daad---22019719397.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/pebew.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/razasazelidovudu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905180225.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/direrekegazufevuwararif.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/zopabekaluwuzobepu.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/85723857391.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/71166107782.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/66626867938.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/83883226229.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/60831505948.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/fitenomopovamas.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/70627404263.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/lajowabekowimisofu.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/pinopif.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406504665c6---musabifadumepuronoj.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/vasujusenuxanuwaxa.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56701148231.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_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 10860 bytes
SHA-256: 6b4972f3c0537adafc9cdd5f078949c3b5ddf597a33dc645f158a06654fefdd7
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 17784 bytes
SHA-256: b4487319e1f5167a0404300e0e00de22ea62bce3f5c139bf74481fda8381a9ea

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