Malicious PDF — malware analysis report

Static analysis result for SHA-256 141f43601643642e…

MALICIOUS

PDF

80.9 KB Created: 2021-07-26 05:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 783bf1a5e14377086e0776b21212592d SHA-1: e62eae74fca22b530fe077e0b29628115c359b2b SHA-256: 141f43601643642e756acb2d17ae84be8455e440acac2df9d04b51917a84a211
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_CALLBACK_LURE heuristics further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://psfund.org/public/uploads/files/cms_files/suvewatozisawurafadesaro.pdf In PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/34180583693.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/lkai85423v6n2d5p0bp0pkktnc/bexax.pdfIn PDF document text
    • http://guitarenko.fr/img/files/wazivurejisazaluvu.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/zaraxufikanunovusuwagelu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae7a0f1729a94675268fe5e901700029/1066240190.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162165034041.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/zujak.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/284532063.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/45612a1969333613b644f3b3ab74e0c5/45638310280.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/fupudanavesuvotob.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/viwesajal.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8748ed6b3a---37661527130.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077588ae284c---92802888776.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d7da713c---47490638057.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/uefu9ud9vv08tvcv4gq89t5uej/54085498288.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234afd11f7---86441082985.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/34367002335.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/79531643486.pdfIn PDF document text
    • https://duzcanlargroup.com/Images/Media/files/nebijema.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3281c4346b---88081502284.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/44e104726b3051264d0dde8772e016a8/jixazarisutadudavogetus.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105241838.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/voximozoma.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/udgoqgr8pkbfjsdhhhgcd26sj2/bafowonivaligesokili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=baixar+jogos+de+psp+para+androidPDF 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_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10708 bytes
SHA-256: 3d6bc57fd70aeefd5d5a4e9fc02546b3ea2cf62b7d4148e52bc21e0ddd15aa3e
font_02_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 18320 bytes
SHA-256: 9b93dab36a5a45b073c525b6de035db342f311bf9d184b1a23b7242d2ae6f6bd