Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1c5e81dc0abff2…

MALICIOUS

PDF

82.4 KB Created: 2021-07-31 01:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 624eb3c6c1c10dcf6e2f298dd6636940 SHA-1: fb65ed71fae23cb700ab59b406b80e9e543f41e6 SHA-256: bd1c5e81dc0abff25ee3422783f5bc0180cbc9e76292017a770d729b4765b42a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Numerous heuristics indicate the document functions as a link farm, embedding many URLs, some pointing to raw IP addresses and compromised WordPress uploads, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inimtrento.it/userfiles/files/65722576557.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/ruraduzevu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qo565hksaid6fjjtkv4o3so10q/vozelifugokikosutev.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160773c4965dd3---veredozurakugugewadovu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vcec5gtlrpl5ilr6f02b2oom26/zunisotevire.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c87c8e2f8---zujuxum.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/sojapagomutenofanuwuri.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2thv90uvjrr5kdneaukr10gt6/xudoledukadujusolavo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/954fe65fd4b3415fd27da8d808e4ebd7/57384846423.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/fst1e0h3phusici55lh2nk6ej6/fojozerutixaj.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/63024584292.pdfIn PDF document text
    • http://kingnature.ru/files/files/53104382999.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d1f1456b78e07dcec0c8906355038584/kejaluxalaraj.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448d29d3cf---rarofer.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/e1p6nv5s5b8u72i8aqt3frsoru/zefeb.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/vivokigu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lozogusozinojefexokelaf.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef02e1128---selokovamam.pdfPDF link annotation
    • https://grouptm2.com/contents//files/97092726405.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wefedoludoro.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/tibujefifatoremixa.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8dbca19e5106345b761f63df0777ffac/zasogux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=defining+non+defining+relative+clause+exercises+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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 11064 bytes
SHA-256: 13821eb29accb7872aa1b23ccc896fdd3acfd63dfb8179f1dbcc22daac18643d
font_02_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 16700 bytes
SHA-256: 6a720ef39afe11f269847239b0dcdd155395b0f077eb4eca56d0586b24621a20

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