Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcab31896a5690b9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 07:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83e5dd6c41440456e0f4be33b0634c03 SHA-1: 2b1ccda8025d945c513c4a537e2dec6f4e1f2846 SHA-256: bcab31896a5690b964e39fc62bc849062a0c88e60ef2e519b26d20df7f30c777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The presence of these links suggests an attempt to manipulate search engine results or direct users to malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://annassteen.com/ckfinder/userfiles/files/88217308594.pdf In PDF document text
    • https://lawina-radom.pl/files/file/ponowelipesulewerobodebi.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/14149490488.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddeb9aae05---91598777138.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/9c7s69a40devad9gh6omnkcegc/2377251974.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608202f893b47---lolakuzeduvigonulamiti.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/89519113010.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609858695bf77---27008957578.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe054ba8d---fedatekijita.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/difofopolosejajexoxogava.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ef3dc425.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/koposijinorax.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2fee1ba5b73383d83df3a9428a22eb4e/lutoxedovarinemazamop.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6ad3d313cab8d3597297db70cd6f5bd0/kufanubak.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/83506639551.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/5823410985.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=molecular+mechanism+of+antisense+molecules+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 10976 bytes
SHA-256: e93a856f19b71a0492f86f25d5b4552fdce5c85ef87de93cd31c43b7e0998343
font_01_sfnt_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 16424 bytes
SHA-256: a8131dab68314fd96c87197b4841c67e428835deba1e1988d081ceee5ab4313d
font_02_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1