Malicious PDF — malware analysis report

Static analysis result for SHA-256 483ddcd172be4e39…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 03:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c248b57399108bcc448b49a5d98976c SHA-1: fff4c628b2e7727713438892c14725523964fd1b SHA-256: 483ddcd172be4e39bb62629e902b59789887aa2a4c27345e2c399972c07f27e1
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=math+equations+worksheets+7th+grade PDF link annotation
    • http://iteequipment.com/clients/65150/File/57329720406.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/topajudikotun.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ellcu2aq05l35birsfpbhtfhmo/21911315551.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/6167084859.pdfIn PDF document text
    • https://maturana.cl/upload/file/mazesutuzezavalo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd102e36aa6---85688278324.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81828012256.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/zeranufusiwigoxelum.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c798f07f2---50055679163.pdfPDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3da03768---bifizamezuvakew.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbbda740b9---feveliso.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/podirebabonumojejupujusen.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/86228693855.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccde94b66e---bedekum.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/xenebemufevoruxopude.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087ee4d8525---pufod.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be825576cd3---barijifilumesatefikusogix.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/80352750006.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/85439898049.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/36288861666.pdfIn PDF document text
    • http://kmsenior.org/file/files/3494560633.pdfIn PDF document text
    • https://udruga-invalida.hr/files/newuvikuzup.pdfIn PDF document text
    • https://master-service.ro/images/file/fapadutobuzagameg.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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 17036 bytes
SHA-256: c914f7b04844e4fa503aa788fbbe8d87d382c2cbbbaf346f745bab8057670701
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 10948 bytes
SHA-256: a2b45acdbd78aa043a62a4ec34662bad6f33c347a5f8ef9b77405caed72206d0

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