Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6e563f866ee7d0…

MALICIOUS

PDF

92.3 KB Created: 2021-07-26 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a2707d346ec29160b9c352833d8cda33 SHA-1: 8164e2fbf0804b6e313c6bf7ff45a8c10b538e2c SHA-256: ec6e563f866ee7d0a09869a9e06341a9317c579c05a67379898223c699a62708
136 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious and contains a link farm pointing to compromised WordPress uploads and disposable hosting. The 'SE_CLICKFIX' heuristic indicates the document attempts social engineering by instructing the user to press Win+R or paste a command, likely to download and execute a second-stage payload. No scripts were extracted, but the presence of embedded URLs and the ClickFix heuristic suggest an attempt to lure the user into executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://gardatrans.com/content/Files/lipodetugexexonaxu.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dmap25gllntikbkb1ead62vgb3/napadoxajanuwax.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/41c657c03e7d0e1664752a1344694322/nurotinuteva.pdfIn PDF document text
    • https://istanajp2.com/contents//files/ponago.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/90900245789.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/74089860044.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ruzorigitij.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/rutarivifipetigesiliweze.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd19895ea0---tevogafaludeminer.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6cc464afb45eca4c01185145fbaec900/gipevekatulusikosotev.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/likitok.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/zugul.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kagedivedakano.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd7fea2821---gikepodavi.pdfIn PDF document text
    • http://dalaichau.com/files/5428708912.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db67f883e7---lomidejalopip.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16095e32d5cfcb---90238883417.pdfIn PDF document text
    • http://klpa.net/userData/board/file/regisaluruximoxevuxi.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/i1jv9qn6gdn2mbb3mshl69kdh9/judalenalubalowupevam.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/segefirufazidalilojob.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/24814752993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+skyblock+map+download+1.12.2PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/03c5478e287893e9092d966c395aa4c8/49804544069.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 11444 bytes
SHA-256: de09664c1766a862e0554b70bedf7430fa13d618c26ac705d4a1a66fd964a969
font_03_sfnt_off00013517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13517 17224 bytes
SHA-256: 10bf2f86f87940b1507af735b545f7df684bdf5ec1217105266dc65ae60d166d

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