Malicious PDF — malware analysis report

Static analysis result for SHA-256 77206b5cbb021751…

MALICIOUS

PDF

87.3 KB Created: 2021-09-04 05:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e5441eefb5c9d6e4b07a05062c1d520 SHA-1: e637fd1ece8f7ead9033d151efe8023ad975fc3a SHA-256: 77206b5cbb02175196209e2f2204ad7c17a4728e43612711a7ba235d0ab15c25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=stem+cell+theory+pdf PDF link annotation
    • https://emprenderem.cl/files/36227262515.pdfIn PDF document text
    • http://airmon.hu/images/files/44026664457.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/42852079588.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/momebakipatevivujo.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/54619110341.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8917ljoj1bs4jquju5cv2oqrh5/97266517474.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/b7cujm1clnq76ajim7lnm6ugc4/tepalodanumipinefiti.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c73b6d9c2a---wodusanasaniz.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1f8c8d75965851260ea2534ea583d37a/15361808885.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/razunomesekojiwafoguge.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/zozaju.pdfIn PDF document text
    • https://12waktu.com/contents//files/jotifebanifasu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031bd08ae38---99607180623.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/zonijivunanamukujalus.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5861b418d468da734534b04871707cce/92436738390.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4a2d9222---repodajogodatonekesami.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jiwejulopeduman.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/sinaluxikixa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c972c8fc---58286633050.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/davufawedez.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/bowex.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4302de2b9---zomavipumoniwaz.pdfIn PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/64285112405.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/102151303.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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 18080 bytes
SHA-256: 7fd56f99fbfec51f6da4cdf7acc1d4872e6dbb0da3d5153ea0f9a51ce50c0a17
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B4 10548 bytes
SHA-256: 3aeff2b79c138a6559ffc470b325a183c4ae81fd4b4a8e6a3bf1ad4e4e48bddc

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