Malicious PDF — malware analysis report

Static analysis result for SHA-256 e033f1d36135d393…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 15:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4bb6bd8f9bc86741c968795c8cf641c SHA-1: b6e7d14a0ed8950d9a60ca2520dfe4acf73b7dcd SHA-256: e033f1d36135d393e96a13c1ec42c35b459331d3786ecfd0e92c1488e43754ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of a link farm pointing to compromised CMS uploads suggests an attempt to obscure the ultimate destination of the user. The document body is heavily obfuscated and unreadable, indicating it is likely a container for malicious content rather than user-facing information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d13799961---83909497737.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2413e80223---zanagubotirijifufitu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lk79a1o3fntgkm1tcjlov4i1kb/56198459968.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/29745321043.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/58359393107.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e4499dd0e88---vumapedopimizez.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/uilrumpa6qcfj7sb8445o2lmur/17863255057.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/5676862877.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/91094830257.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/83094938794.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d623d27d533---popazowedaz.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160733a16985c2---dumivif.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/ridatonokukuzowuriruvi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6643b0285---50903960758.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f5c1c9a6---75443072936.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/pelutamiwa.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/suxoloni.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wonorupiwojufi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea8a9c2d4---wekuzasavavarolaveluxad.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/62532748309.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160815fadb4830---deluloni.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b78d8c8f8b1fc739918cdf854e0cb8b/zoterem.pdfIn PDF document text
    • http://www.bash.cl/media/file/39128870014.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607558032d56c---virizekixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=brother+mfc+7860dw+user+manualPDF 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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 11436 bytes
SHA-256: 6e6adc8af2b15e4bba49786695b4b1405cb6009096d105e5fe55504b630b2359
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 17472 bytes
SHA-256: c0b4771abd8c1308b10d92c6390f66d7ba8f52828b99d6001e2a0c78140ea3bb
font_02_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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