Malicious PDF — malware analysis report

Static analysis result for SHA-256 f310863ba9c9be8a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 05:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7a610fb8f6a3e88288cc5727572489e SHA-1: c9ae657e46088bd83784a7be67a3e826bb2763c2 SHA-256: f310863ba9c9be8a0142117ce97e2e63208a9b95a8810691c7b00c8d11e6542b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://etonbio.com/newsLetters/images/file/batujomaxedu.pdf In PDF document text
    • http://luluscafeonline.com/uploads/files/tetugofogat.pdfIn PDF document text
    • https://adikketiga.com/contents//files/45352463377.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9o452gn31r5v7cjdsb2ddvq07v/jipenibizipobitedudixam.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fd79e69bed816e950e1eff486af629a6/14477770150.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/89677769488.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/21687343027.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096ee91c060b---lilapawi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/57733324852.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9840dcbbf49a84980274a4e183b0766f/2256544534.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/81725419563.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/24467801675.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/kapajer.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5ffa41340b3f0b2b646ca88436b8edb9/81943044480.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/filesomudutesasekugepasas.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826618db3e9---19872382794.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/pudawiririwivepiwi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210605072418.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/70340314155.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/36817565660.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/a5b6lvu5l4lmu24f345t0h3to6/milaxotakubudegonefepab.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ba0154358a11eb1e4e902741edb6cefb/petasetovuleluvoguludo.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/wubegizamilojigez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=invention+list+with+inventor+pdfPDF 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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 10536 bytes
SHA-256: bcdf5256719714c2f8db3137d7d19c3652e9268ef4d8cd813cddc48ad9d493af
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 18056 bytes
SHA-256: 0d245fc697468daf28dd49cae8ddedfcb8d51ed5e5100f762f56540916aabc82
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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