Malicious PDF — malware analysis report

Static analysis result for SHA-256 0266a6fabb155983…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 19:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50c44db55cc09a8bcf4abddef8b51832 SHA-1: 23722e004458f8f7673287003b9534a29f34a018 SHA-256: 0266a6fabb15598398fccc69ad3498b03c732716737f493a7d9e3af885d48c77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e3207671---zugupubevibuk.pdf In PDF document text
    • http://lienming-rubber.com/uploads/files/202109100818354069.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/g74a5np964q3ba6vg8335rdk94/91668921526.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/sisilatepa.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e6d2c4e02272de051d0a26fb2abb9ad1/vipebesekisutipamedasonab.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nutumaxonasedaladavusem.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/besimazebi.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/motonavibitof.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/36620609867.pdfIn PDF document text
    • http://sns.hu/_user/file/53800942974.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wagimonuleje.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/dixojudisubub.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bifiw.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/94220627135.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/fesaxegot.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bukanegoworenotisi.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/17070166531.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/sewenibugizi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b12ecead72428db92e2e75fc5c8b65ca/nofagura.pdfIn PDF document text
    • http://sinoorchids.com/image/file/77194232206.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/62871138074.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/tokifonulowaluxufe.pdfIn PDF document text
    • https://nomortiga.com/contents/files/gevelirebaxugutigenusep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=inotia+4+unlimited+gemsPDF 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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 19888 bytes
SHA-256: 10cc39348e40648ec4b3b7090d0aa943524af1d8528a96ec82b8afb926cd4443
font_01_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 10620 bytes
SHA-256: 80162ca5e1f6248dff49dbe5e1a7c36ab1c99ca224849e28f24e5abca9290ee4
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1