Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a08a39fb09e3dd5…

MALICIOUS

PDF

138.6 KB Created: 2021-07-04 21:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e7cf813b939c9e3b3b4934c96a70363a SHA-1: d8eacb95ae72364ca31aad40a3af3cc774b5e04d SHA-256: 4a08a39fb09e3dd520dfe23cdc7ea781cf3b5041b891335f5efce2f69b13565b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://alhouti.com/userfiles/file/20650784915.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/70c14e8864abd98e90430e937b172d4d/24802839665.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c39279dfaf2---girepu.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/josiva.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e01b37b0eb---64958994986.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/ladikato.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1083c014e2---68901851407.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/raziz.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/83596567794.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6a0ef422---xigeka.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/60040042923.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080530ea20c7---woxelivojuporegarodubip.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/siridazivozunarosume.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gufalolakojobagoribimorur.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ed1a952c---gibidebogijinebudel.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/73788776316.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8473da93b4---85814248986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2.6+practice+a+algebra+1+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A371 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_01_sfnt_off0001b90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D124 10964 bytes
SHA-256: 60c14f4b659f876753416ffa8ba63279822c6d50dec1f4432716f5cbb33e8a64
font_03_sfnt_off0001eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAA0 18804 bytes
SHA-256: a7f68429dba0383f69e6b241ded61e049c959bcb85cd44c62db7aaa8644f515a