Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ff0f8d9c853c8c…

MALICIOUS

PDF

162.2 KB Created: 2021-08-12 09:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7de5f39e0986138860156ef807e037ea SHA-1: 2031dec325e207237bb232082dc432561b20ecf8 SHA-256: 97ff0f8d9c853c8ca1293bf12dfa2d309a76568320c17b17269a86b7325ae143
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://menlopark.com/wysiwygfiles/file/47650210567.pdf In PDF document text
    • http://ilovehikari.com/uploads/files/15310277999.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad54041bfa---14451821498.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/magasosixadozemowixudune.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/pibonezuxi.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wododesitebobujugez.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/60687424150.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/dudodawaxexetezofoseka.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/96566601297.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89dfea960c---15819301397.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071320b08af1.pdfIn PDF document text
    • http://yanartextil.com/firma/files/10675811152.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/555qosnijflot0jgdtac91mfke/rukunafedokutowux.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9981114c3---nuxokazuxedeza.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/54153080252.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ebf5042e0---nodevenizux.pdfIn PDF document text
    • http://falerisztika.hu/tmp/72890574124.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/xidorerowenetunepum.pdfIn PDF document text
    • http://fygl.net/uploads/file/100058576132.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ab4067bd4---vigupopewebipexedaza.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/lanozuwan.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/l2hrh9oeatob8p8j4mf9j6gcno/fetimekofidadabaribetol.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c8e9e6c2d4f7eef84627ea7ebfb4f6ea/vigetebikazepafiwiguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pass+illinois+dmv+vision+testPDF 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_off00021a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23273 10596 bytes
SHA-256: 9398da3b1a4b009335be26b8e06e26a80e7f5560bc156522a5a91d9dd02b2855
font_02_sfnt_off00024aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AA8 17972 bytes
SHA-256: 0fdfc7c6e01f4393594fd620f5a9aebec65fe28e72fc417004ad051fa8547b20