Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb921c1d20bae7dd…

MALICIOUS

PDF

114.7 KB Created: 2021-09-03 08:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1481170500a4023e983a2c6b0b60c419 SHA-1: 8269b84b43fb740ca0d08b987fce393141445345 SHA-256: bb921c1d20bae7dd99c110d92760f0fbb14c3a83d04f2d996271ba3f86a8523d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bafc18ab---91475045599.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/fec205ae15a0760803eb8bdbdc0377c3/xejawujuputapemuwazan.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/sunudijuxem.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/876ljj2bhedsjkf6e925kohst7/xadimexogodalesodafurem.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/nepixutixidetuwax.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xapanogotorebavivazojovu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/jifowunuwasisozikop.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/mofomup.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/91563599750.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3ee892eb---zemujegokugigapuwol.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104c89e684e3---57096204648.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087de5f94ce8---rigulojamitedemutitanare.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a716c1d2---37987709126.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612123278a54e---6184608243.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6295b3325---85089454948.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/navew.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210624122137_r1bo1x.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/24641020415.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/xibomiboronenepiretabovu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da43185084b---buwewasuposakolifof.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/bizudilevafujitetur.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/21a8709110d038a504364e66c4806809/kinujewa.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cc7cc0814d4657fcfc55d17205604a79/rosidijojufixoxit.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rqt97g3dqs5g557mbflc53j8g1/bipapisorufoxexivitigime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jcr+impact+factor+list+2017+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14153 10880 bytes
SHA-256: 06f984065301baa90609a79aac0259ea982373d506d53e0296d2b7a686314949
font_01_sfnt_off00015aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA0 25276 bytes
SHA-256: 7c49d46cc8d61146b93b7323fce76f708d8cf4a6118dd566e038893b48d7c186
font_02_sfnt_off00019ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F5 1924 bytes
SHA-256: b186cb3ef4e9f23bfd5ac91bd90e35bee80ede8fd0e210dca077e3a0d756e759