Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdaa3b821c167b5…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 12:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5227d1adfce9964577f89f4350ce560 SHA-1: 5b4590759c5c44c83e13af3c9b634eda221e5918 SHA-256: 4bdaa3b821c167b5156e462c42a46867d64e2dbabd662a9e981bc0b5fde47e04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, that are designed to appear as software download links, specifically mentioning 'adobe photoshop cs6 crack'. This suggests a phishing or scam attempt to lure users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f165b6dd82e60c1b30c98a263d4b3686/19660507529.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1656e1ae---vukogoxamojux.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e6385ae7ba978984984d3c8e48eadb2c/mavudazenilidamonimug.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/xovifegigadoxapivakub.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/70878213962.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/a0a53da75d84c02b039ff62e00cf6f65/watotuvibamuram.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5bd134ace28e6cb1b30150505c7a6a01/80139059622.pdfIn PDF document text
    • https://yuss.it/file/jirisawigepewofe.pdfIn PDF document text
    • http://chromoink.com/updates/file/53258921471.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5af2ee08---lumagukejegiwulonutikoli.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab00828ca0d---keperitufeno.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/96546243261.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/70818221943.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jidujiwudebe.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/8532147164.pdfIn PDF document text
    • http://ecole.ru/text/images/file/waweb.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a465dfa1729---2397354535.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/75a2eabc14c888bca338007f67f5df2d/lonevuradesi.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16213233072288.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/438kg6t2b0htgqvkcdo1upvb5m/pemiwotepamowosozunazujab.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/zitopogofopemimitip.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/38755853244.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9c6ab5d3921d6158b3d4edadfb025101/luviwadezabesukolo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081baf11aab7---sigun.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5450873d---zebexitaxivugobelinovenuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=adobe+photoshop+cs6+crack+2016+full+serial+number+downloadPDF 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_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 30388 bytes
SHA-256: 9df25f2e18d5f3642cede8d79a32e84e5264a56cf1a56be370b35b379766ae1b
font_01_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B90 11748 bytes
SHA-256: 99a593ae672bd72a5894a3d33d6baa9379be67441b6499757bc2acc3c609d8f7