Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19a1120e67be48d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 19:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 788d2cadabbbb96fe659ac04d84f7a4e SHA-1: fb29844037aad319ebe4b2cc8f00ad674aade024 SHA-256: b19a1120e67be48dfe01b80cdd261884ee3db4d92ab9a300b3109e5d2b2f86e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The embedded JavaScript stream and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=daana+paani+full+movie PDF link annotation
    • https://nieruchomoscikomercyjne.co/files/file/ravajanital.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/20070585313.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/vodunuxaxirolif.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/14297957638.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/su8ughcvtirfq69j2dpvcfmq4h/67380270083.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/miwipivivadavitov.pdfIn PDF document text
    • http://szm.hu/userfiles/file/6568154988.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/50069619957.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/lisuzizewigajiwimugubeko.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/92333786815.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/18527907254.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/weripusifipoj.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/10952673331.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t1rvas79sd8l8rrkn6ova4a63/ninisix.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/97459966470.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9920b1b487d39663e8d8269a99eeff16/43751071725.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/dilulasisomememu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/71360262384.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909165823.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87911387718.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/sovibejosubekesapuliva.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449c8119388---92024982596.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_off0000c1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E9 17044 bytes
SHA-256: ccb92ec6cdfb2f668433e682e25367657c755f8de93b6179afb85dd70afbd8c3
font_01_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10320 bytes
SHA-256: aa81adc0a80bb2003c0a9011c64ab971836e4b584a7303fec7fc1d54d14ed296