Malicious PDF — malware analysis report

Static analysis result for SHA-256 a871553cf3c4c154…

MALICIOUS

PDF

90.8 KB Created: 2021-09-04 11:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be34ec5c62511ff369de5acca1c63ee7 SHA-1: 924f7f0529565fc52d451ca7d788af1bc19d6117 SHA-256: a871553cf3c4c154d4ae1999dd0fdd9719d68379ffa0b8e7605c8f17857e79af
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b880e27d57f---73148640904.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fb7e78b259e---rilowuweganeg.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/90332383071.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/087e2af0dd4703592b43d40845103cc1/26873539378.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/wajabezonubodeniwafa.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0b0023a8---23249512920.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/13035630773.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17986894734.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/667667368.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210825074332114.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/fogiwiwevoviv.pdfIn PDF document text
    • https://p87.hu/files/16531482082.pdfIn PDF document text
    • https://congchung7.vn/upload/file/68671766447.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/89912465260.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/jutixofoju.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2194c9c4a5e3f4ad6e6342f86ba13556/benajodirenutewoj.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/muxox.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/rezuve.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/febejonekove.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a259bc85ae1---3513850461.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ff1630475---bilulizubusab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=short+stories+with+questions+pdf+grade+3PDF 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_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 18628 bytes
SHA-256: 6e99952d23e803ec391101a8e92261d7decaf76fedb4cbe737344c5acdc5a38c
font_01_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 11312 bytes
SHA-256: 69d784dbe80edbec70276f68f4984e68d949d70419c8793ff136806e620a26a3
font_02_sfnt_off000145b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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