Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f037b1371eafbb…

MALICIOUS

PDF

202.1 KB Created: 2021-06-21 12:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b085a49dc1ef7fce6ef9cf2416353d40 SHA-1: c45b435b10cf0bfbcbf8264bf8bbb0a6ce0ecdd9 SHA-256: b7f037b1371eafbb76cfce88b05f07152e88a57cfc95691948069c69a4c29368
146 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a malicious phishing document, with multiple links pointing to compromised WordPress uploads. The embedded URL, while appearing benign, is part of a lure to trick users into downloading the actual malicious PDF hosted on an IP address. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • 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://drapikowski.pl/uploaded/fck_files/file/89216687676.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1851e9a7d1044ef8b2d5099fecb448d/kipinipalomopejenifexupez.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0896994ba5---61759016711.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160834ea7a93b1---nibomiz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6fd730cc---51976146768.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac96e2b4bb---59491858440.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef81513d02---98986893407.pdfPDF link annotation
    • https://mosallaesf.ir/uploads/ck/files/59324349702.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/jizologe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7138f2a1919733e4fb910a72c64b9210/72779043.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622502521.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ce877e20---16798843310.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b27ede8dbe7bb8043e7f1b862b6d1d53/92339456037.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/42846100865.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1e4b988e504c5acc6bd2dd55f2cbc712/72693963708.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4msm2dl4cl67tt1j9fbus8053f/gurobuwawuraxugoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+house+of+wax+full+movie+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B527 10152 bytes
SHA-256: 49a35665c0248e156c253d68926f37bf69f8319eb5daec19a27797a677cf267d
font_01_sfnt_off0002d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D6B7 5220 bytes
SHA-256: 94afcbda5e5d4a003b01a38cc2c979eb95b9bbd1da02035cea70a2d6ea359430
font_02_sfnt_off0002e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E875 17192 bytes
SHA-256: 54827a8a45716031a330514afe04d9455a1017a590c341b77ee59715d1952601