Malicious PDF — malware analysis report

Static analysis result for SHA-256 c307944da1a33b23…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 15:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9c2a60a53a9e01040487722dff22d91 SHA-1: 9185f8f4ffb5380bcbf64c1fa933e631d16850f0 SHA-256: c307944da1a33b23c37ba9b473653060b49a38161492710a54bc9aa862e7bb2a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-distributing sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://getracemirates.com/userfiles/files/85758656282.pdf In PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-13/20210813000950472031.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pofubune.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/10984842313.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/92127914245.pdfIn PDF document text
    • https://masihpt1.com/contents//files/kiriveje.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160767b54a48f8---73605464319.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c7a56a4b---46748215988.pdfIn PDF document text
    • http://moneymaker-gold.de/files/56924401320.pdfIn PDF document text
    • https://energooptima.hu/upload/File/vuxanokazubaze.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/36590746640.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/67135703684.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/350740fe0c19a52fe737bb306ffcc616/mewimuzujulexibax.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4cbd023df---83323860774.pdfIn PDF document text
    • http://ippon.lv/uploads/File/89436833256.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/61152996802.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/hb156apdjhrhh5fupjv4sknfn3/mezawusanebiwizunafiva.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/39997173813.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/30758527196.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160e66c1255461---potogeporoziwenidanit.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/38509442194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=carta+magna+inglaterra+1215+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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 10892 bytes
SHA-256: 02bc1f026046c7b112de03704a8c199afde46066524170fb1a5974514ca93687
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 18560 bytes
SHA-256: d6e8350018ef05904515fd24603e4f4e4e276523db3109e593ed37cfb506e8e2
font_02_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1