Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fa070e381dee82…

MALICIOUS

PDF

267.3 KB Created: 2021-07-08 13:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a3b6af4c0f03e2a11929c7332dd4125f SHA-1: 37f4e68776b90b0ada6a77f7f531f3921a38b57b SHA-256: 03fa070e381dee825954f2b44aa63e9be88ab3fa8907093a4381c2de36ae4081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories or unknown PDF files, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. No scripts were extracted, but the link farm and compromised CMS upload links are high-priority indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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 http://mikailang.net/userfiles/file/20210509094135_767621936.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f183d680---biwoniziduvikefotiw.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ohhigap41m0dqm0m9hdtgvacqj/pibivozesawifotubosilek.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/2745833944.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdc658feb---zesexasewur.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/28390724263.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mepunitogubawiz.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16096a8695ad1a---badusakude.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/80428374303.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607052e9b7323---sijazidalexifuveji.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/63917674303.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/loriwaradabaxibikurukamak.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/75804683652.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/3339560332.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/rafufer.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b4r5o9r5i8v7r8tnoneql8uanq/fonofibemoz.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/4855300638.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d2855c41595---66437362233.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982ba84433---zalofusezur.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5bb16ea7---68532138269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cockles+and+musselsPDF 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_off0003b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B944 20592 bytes
SHA-256: 1333d8865cd703f1056ee445f5adf2f91183230de6334da17f571125b3eaa22f
font_01_sfnt_off0003ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00040757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40757 10464 bytes
SHA-256: 104808ceceb6bc8287f6a164114edee4d52c788474d0ee31169c61a0ea74c6f5