Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c980f71d5ff7b6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 14:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d624dbe4def047d508c3668f1ead810 SHA-1: 1ab827fc6e16e31aa016da4367f8de6542a873fd SHA-256: 30c980f71d5ff7b6e295d9949392e3b772bb3cd234fd83ece9c45ace24198ef6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirect chains. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=penicillins+antibiotics+pdf PDF link annotation
    • http://morebricks.com/ckfinder/userfiles/files/risozir.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/basanakiv.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/75278496958.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/460468f3824cbb2efeab96624734b0fa/28904400050.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea8db7c2d---79999019180.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7adec6f5b753379f542f9dd0bf7ca1dc/jexafogez.pdfIn PDF document text
    • http://kingnature.ru/files/files/30731614551.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/vazewuti.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/17701369424.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/5393129208.pdfIn PDF document text
    • https://brod-plovdiv.com/images/muvim.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/21766047260.pdfIn PDF document text
    • http://rococosofa.com/files/files/95282147781.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///14526418738.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/tirovujakegejamasagere.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/67439361465.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0099a27b0---3590781235.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246824e978---59763663622.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/78842737846.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed6a5c07f6---65339200381.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/65929849097.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/39419923498.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfda38ec5c---67865056005.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210527020616.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_off0000b6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AE 15160 bytes
SHA-256: 1d5ae3fb0c4bed6254d1de87846992b72f2365de2744ff279bdd432a52981d7c
font_01_sfnt_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 10656 bytes
SHA-256: dd51363a94d361f1d164b42b89ef0b7e61c612d2ce6db342ee24d7bca026d6cc
font_02_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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