Malicious PDF — malware analysis report

Static analysis result for SHA-256 8502c8070e2af5ff…

MALICIOUS

PDF

78.0 KB Created: 2021-06-26 06:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e63b48e7a7f9438df0372322e5bf834d SHA-1: 9fadd21767743cd31d51d3e1811efae03b80d3ad SHA-256: 8502c8070e2af5ffa64ba848e0ba326148cec6f17bc545751f6b534a24d4701b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress sites and IP addresses, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URIs point towards exploitation of PDF vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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.
  • 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://nowyhotelik.pl/userfiles/file/76221827934.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7t0srgtsisbjn0g2r1bpt15o54/17060450180.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609517cff1a25---40009289424.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/60471350094.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/negefodezewozowilaletusom.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d964cb042f---wemidizukevaponuzufi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/77745850956.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c65516461---50606363025.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1ddd586b---lupizabazaberozopopibuna.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf22ab47db2---bumozunidog.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/rikuzutup.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607398213e32a---vidazisudesewa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8hi4tje44h1psqbf7aoik1jiq2/601378155.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0abe9ad7---givejetor.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/694fbcd2f84fd29ec4dda7683a021646/56131349885.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/bobapef.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/vijejatomamixebilav.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e02fdeb3a---ziwuzumimadoda.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/30906201711.pdfIn PDF document text
    • http://sns.hu/_user/file/79645723369.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir2hg8uiul0f2nrt10jluce1vn/juwisaxaxaxukopirax.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43eca028f---simunut.pdfPDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70df718a7---46091512403.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/rurulanisiwe.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/9061635908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=licensing+and+regulatory+affairsPDF 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_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 16948 bytes
SHA-256: 3f6ff7327ab8ee5079f6ef34914f31c8cc721113b60b52f5820041de7e2a0c68
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 10824 bytes
SHA-256: 0cdf02d9b4d61a4d3c526b6487f7365bde6071d1950504260d2712b9edc22d2f

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