Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcc0b6de3c336d6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 21:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 241885066e1d1bc2e4ac7dc18c9cab04 SHA-1: 58423886b5a3735fa68286f509ad9bc677c4985e SHA-256: bbcc0b6de3c336d6db36bfd57f3600583d43a64e9204c3ac24b8611223e7e5fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were directly extracted, the nature of the links and the detection names imply a phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/92baa5642ce26272dbbc49a5d3fcf4bc/65262348392.pdf In PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/26225377122.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/negogunefobujar.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/joxenodorawimumewo.pdfIn PDF document text
    • http://iviltra.lt/images/files/sinutexasijas.pdfIn PDF document text
    • https://dacola.com/upload/files/nebub.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/585d4a74f1366220922abda9e6e17e95/80055810073.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210513225536.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a20a333244fdf781f77f3d1cc1d2f61d/mosufuzijibibovapiko.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/16414689145.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/folugarefexamexewujanad.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/15253339829.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd90096622---riwavuw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee7f5434f---89949684374.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160e61be7a2daa---vaxagetazasijixavor.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/96085182256.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d5vgjqh616h2b4d5vlsonogm1j/nagoribudobevedadavo.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/safesamuvadanezetokajevuk.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7bcc0a9c0---50846033515.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/rudalezapifo.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/97756716748.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/jerejimibisuponalorepo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/62710168782.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1fb022b2---niwozodedalalotivuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=glencoe+math+algebra+1+worksheet+answersPDF 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_off0000b68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68E 10992 bytes
SHA-256: 1e1ea430c74177a7b008f80e3cfa8f049d0252259dab4b1990a4fec0d18ebbfe
font_01_sfnt_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 15420 bytes
SHA-256: ec409c13a5c4c50f2afa9e7a615717131d847ef99318d450ef4083f0a50bab38
font_02_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1