Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a70721bea68a65…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 20:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2329403e51057000cc5d74577237bd3 SHA-1: 6c82925b2a2d70e7769a3874b7009bfde3eb9c38 SHA-256: 16a70721bea68a657ceaab9df82eadf1cf22c768a11e88c27a91524a75b69145
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised WordPress upload directories or disposable hosting, strongly suggests a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://cian.hr/userfiles/file/48422599798.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16145cabd54abd---suseba.pdfIn PDF document text
    • https://gencatakan.com/upload/file/55691896260.pdfIn PDF document text
    • http://labotinnghia.com/img/files/dilazufafijopimubu.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/nafugunegasibejexewof.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319a02b0d15---22326228752.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/megimuzoni.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/12695223973.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146a28d3f2d9---54885807227.pdfIn PDF document text
    • https://termoformat.md/img/files/5134467045.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/74291298285.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/16018256528.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/vibotig.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/jibekumumonifadunasiju.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/57670891445.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/47062161079.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/nuzavuxonolefopoxijara.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/77227216770.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/lexekefigokokulo.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/lerorekakosetuzuvomofoxu.pdfIn PDF document text
    • http://midospa.com/upload/files/fivolosewe.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/29650272671.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a74c16487bfae8d11a3ba9a6816b0fe4/lafevupulosewisulefuzaren.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/bipopejigiwofef.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/televatujokoborasifejet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mr+driving+mod+apkPDF 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_off0000afd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 10444 bytes
SHA-256: 7d0d33f98ff19fe88d2f876063b0eba5b1400bd8f2d157b753e4a20c7129941a
font_01_sfnt_off0000c742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 14596 bytes
SHA-256: 49e543a3ade25482a5675abe9f4998b2cf07946d6d3384b2be466493507ef99c

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