Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da9a31df8df4fda…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 11:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 02c47bb087436736bdede562b091878a SHA-1: 66bbe11c16ad8d7d1a576a11f06a5cb1d6e8ef1f SHA-256: 1da9a31df8df4fdaedb4b3cdd9b40706c90b557f9d48f09e73db1e92e663a7bb
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised websites or disposable hosting, and one specifically identified as a malicious redirector. The document body text, while truncated, includes search-engine-optimized phrases like 'Can i cast my phone screen to my ps4' suggesting a lure to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614064d087356---nofexonilugafivefojeneje.pdf In PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/tanavuza.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/7297248577.pdfPDF link annotation
    • http://robfredo.com/userfiles/file/tivesotet.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/vutidukudobupe.pdfIn PDF document text
    • http://dhf-china.com/d/files/jonudokesiwuwebifuzi.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/92544496192.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/32021162159.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/3144048397.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/kesolem.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109121156397244.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610a6c5147---31447751265.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/79290325780.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6f94f65c9db62d8e4310d8deafd32f46/wevusup.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/botumudigumadi.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bugagedopup.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wejazumubejevetodezek.pdfIn PDF document text
    • http://spakimthi.com/upload/files/5907363324.pdfIn PDF document text
    • http://reichspfarrer.sk/file/40839338973.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/kogajegobixuwelofi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613268c639c35---47439355241.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/79015563297.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/86096378999.pdfIn PDF document text
    • https://infrive.ru/uplcv?utm_term=can+i+cast+my+phone+screen+to+my+ps4In 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 extracted file (font_00_sfnt_off0000dc5d.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000dc5d.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10816 bytes
SHA-256: e49608c29cb0f850479b33cf6c96f36d2f1393528dbfe1fceb6eba0476bbf943
font_01_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 17724 bytes
SHA-256: b90fd17d12964383d9471035b68284766a78e0822681941d71a9114884a43a2c