Malicious PDF — malware analysis report

Static analysis result for SHA-256 d960dd247654e6ed…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 03:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23b3bdf69e35585763b307eca1514ee2 SHA-1: ce628a082511c59ccf2280d2ba5548dcf87bf10d SHA-256: d960dd247654e6ed2ba5b9a19d6b1106d8d0c2665d2218fc6f072c9bc959a4f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://hftyby.com/upload_fck/file/2021-9-3/20210903094340685053.pdf In PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/bawawoluzavopadubimenifi.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/devotiwil.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/25505654710.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612194d924c43---2889927464.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ac77b958e---10092663483.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/29c1f24d5c13a0487a7642c72a50ff7c/30062309178.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/wadavofasipimumototibij.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pasegijilivokilagelozore.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1fu0r8i1i2hmbt2drr5h9u9jr3/tasekujemoxabilosefeba.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/66373973609.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6331cf87d5e6bc077d65336787ca10e/69683440989.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/pedukodabopa.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/25491918136.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/jiwubirifisejujimi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314e9987eb3---bafodepamoxigewekemigajex.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/83996633841.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210621045625.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955b2a97db---24389073439.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/45753015245.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2da77840b---tafedelutixasizo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_040822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=molaridade+formula+pdfPDF 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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 10384 bytes
SHA-256: d034b9f65fd191313d96b8720fe46a0551b533e1f3670541117bfb6955873081
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 18244 bytes
SHA-256: d0c083032cf716beda9ccb284b2ef533d1b8dda38b131bc906a1e0035486d764
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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