Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e7785314698a11…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 02:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4304eac3b7074d555e609d9b7ff426f SHA-1: 50e4b1e15de07f72305168b1a872af9b1d94af37 SHA-256: 17e7785314698a11772c3120880b716c122ecff395f1ca20aaa6257b63ee8555
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=antivirus+for+android+security+paid+apk', suggest a lure related to software downloads or potentially phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=antivirus+for+android+security+paid+apk PDF link annotation
    • http://chocoenglish.com/_UploadFile/Images/file/89593331256.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/guwadiwopomudutapasideku.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/53915521400.pdfIn PDF document text
    • https://tsolisp.com/files/file/vogowotenidu.pdfIn PDF document text
    • http://punaide.com/userfiles/files/newuwupubomijadizazogadur.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/55675521878.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/rabupugoxojelogijod.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/38897230328.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/444302a83f742cbd8e7bf4158c7a4dec/lenogajeripanuwof.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bf7e35e5832bf5d9924b8f178d522f63/pomenurinof.pdfIn PDF document text
    • https://12shio4.com/contents/files/bigow.pdfIn PDF document text
    • http://artospace.com/pics/file/65785304042.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410118d7f3c---tonugefurikamo.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/wuwuwuzewosukenerek.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/tolasulupise.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/vojab.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138037e1bcdb---folefawoxusivexa.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/vidor.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/11286342790.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/49918861434.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161466a63af308---sebupivenikukusujim.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/vazevagajozokasogeb.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/pitoxutakerokeva.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/tilumavorosegidono.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_off0000c004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 10920 bytes
SHA-256: d845c597e8fd783e280073e54c30343d3e8b81ba01c74184e2e2ffce8e9ec18f
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16368 bytes
SHA-256: 7a00e59b6d441a716acbd52a1deb696d92b27642a75409c7ebc27c35af0d7089

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