Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd0d778a68e2eda…

MALICIOUS

PDF

86.0 KB Created: 2021-07-05 02:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ea11206fb5424460be810a67d8b46d57 SHA-1: 48b03c570c243350073fa90594c0557940a0bc21 SHA-256: 9bd0d778a68e2eda4edba8758e50ff9283f79049249970721f3ec5e0bc17ae6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=eevee+evolutions+colouring+pages PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2616fba7cab759549eddca8f2f2332f3/detebujananukanobu.pdfIn PDF document text
    • https://samowar.ch/upload/file/13727827402.pdfIn PDF document text
    • http://oodow.cn/upload/file/210620072537671528fx6plsgxtjx6.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d1cb8ec3223a715e0256df59f79bd780/vezedodubepisikawox.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/vazisobitajivenuwoxoporaz.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c20efce31b0---dudexurevajavu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/fawagutevejis.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/585ee157e088194be566de8415d619f6/26610684363.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/55985107319.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/26780495fd3e55b929783ebf72203793/715585269.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/33e0186782ca2c75429320e5d7a6fcbc/10430375747.pdfIn PDF document text
    • http://toonesk.com/upload/soviture.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/80783621574.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b61a77332cf---23957858074.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210531060606_1655902780.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/rutugawolegotu.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/gemapim.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/501431d7aa5855477a032e03e10ddaa8/xelopuvorugi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a257d2d0193cc4aca4c415591fe39f91/18957580991.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/58047826469.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074495c4940e---15081984801.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/43241111369.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/04e42ab852c8dc449008f5c30c26c988/karipirarusinup.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_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 10696 bytes
SHA-256: 3acdd959333c48f8a827e9b73363a89b09a8a46f9b899909ca0ddfdc64f815e4
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16912 bytes
SHA-256: c2431f14ed6c75732ac0c3d523fd7d1f20dd9c55e97fa67c9b294205238ffa64
font_02_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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