Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e57f896bbfbabc…

MALICIOUS

PDF

83.4 KB Created: 2021-06-30 12:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 709b7ad74d0871f931b28e269134d46f SHA-1: 46aaadc0846ef9093dc7cfd01f18d2b71858f4c5 SHA-256: 33e57f896bbfbabcad0aed5888941d09ff8289368c172ec927a4c4a362ef2c32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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 https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/u2h1e646diotjnhfvf7d0j8oo2/92923840410.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c91852bc058a7635d390a09a9e2486de/93556493298.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e6f15e63---6874361217.pdfIn PDF document text
    • https://anfauglir.com/images/file/zaxolisamivepumek.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/77632a398a89f59373dd937a5507e001/6978902849.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c634869ac5b---65298649619.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/voteluwevujofodiropor.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cabc7e7718a9685cba50f15867192733/luxeridafema.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/nebilodibabazupare.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160782a5ab0896---81578775814.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ac273d40---nidezofemudazazefixuguli.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/wudezepunimupogad.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/13265940743.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81845650823.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/11324120189.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aed2000---jujifiwobefididexitevew.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/vowemufa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gulelesutuwuvuvamewi.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/pavulezosabizuvujinuwe.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae889c1248---guzibijeme.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf9a89d6e---68538127823.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecb751d4e---torifabokisovazit.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0221ae5b8acd55c73f9c012570232c29/lobidomajomowupekopa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b58e0fc5c---24623360064.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dee609b9135c11567d00e9199e97c68c/gaxakuvatebulolateduv.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880331e3674---negidunasolunaronej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=100+g+to+lbsPDF 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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 9912 bytes
SHA-256: fdb4477c44015c109323ea1dfff16915ec1870a1e4d2fa056f01f3c227d00110
font_02_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 17536 bytes
SHA-256: 57a959a27c808945d9458191adc9f9581495cff7fe7bf9aa8c85e385ee908179

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