Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c61113dfc2d69c3…

MALICIOUS

PDF

86.4 KB Created: 2021-08-17 10:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d815aafd6fdc44df4667b636cedbc207 SHA-1: 8de350812a93659221cc935b380008db34e2b910 SHA-256: 8c61113dfc2d69c3a90ca0fc722189a024eb50c107e9d6cef7b9c3e8f2359493
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a49dd155897c7d288b2b21f4fc56df60/dumodizewiforid.pdf In PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/70086331615.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/wumowepinidovawexuzujanur.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/sonit.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/91432691139.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/norikojoloru.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cfb32ddd9b67738b4c7dabac9693a706/sepidobetanejuva.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/78216995108.pdfIn PDF document text
    • https://emmaushuis.org/pages/pimulegasozutilawamotisum.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/77042644082.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/28842381362.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/denalude.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/sigaxenumasu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/89kcojmlp4s0vkogcqq24lrcj7/sajiluxefosi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecdc3d1bf5c---napaxago.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/98922046378.pdfIn PDF document text
    • https://tavio.ru/files/file/81383642372.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/dowosan.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad58690852---46469971767.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3db5a1a64---zogavowurururugodejatu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9824ab377---38391188496.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/puxadevitibanutimajerulaz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmogml0eh3epn9lcunh0jsacs1/moxabinasagazemelaselure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reheat+little+caesars+deep+dish+pizzaPDF 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_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10644 bytes
SHA-256: b1bf12e39a12f19b4fb9358a5d4b7f0c4612a3d966175b423f24b95cb2eef935
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 17536 bytes
SHA-256: ff83ab9ee7adf1a699cce9b09d67280376ae0eb7a15b791bc346be5446160011

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