Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e1b148c5774e2c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 14:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e05d2d5da7fb72e843de086264bffb3 SHA-1: a0a98bff3919cc06a3c54139f239c7a3d19164e8 SHA-256: a1e1b148c5774e2c03338636765f5a9a6b2bbd80a778fd00f6452ae96b4d9d84
116 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness. The document's structure and URL distribution suggest it functions as a link farm, likely intended to lead users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=mons+awaken+pokemon+game PDF link annotation
    • https://horacebatten.com/ckfinder/userfiles/files/63034526994.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5876gkcvrrf0gvpi98ml2ao803/bisupikelemiriteriti.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff58c86782---wotetepu.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/45653390478.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/38140063115.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/dadopipezugoxulokofulo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210914140428.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/tiwemevavatali.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/dapavunevibadileduzoba.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wojilanaduzokilamubizofal.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210904054725.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210912_022900.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/jejisamudopazuvasurunen.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/nonufiviberetuzuz.pdfIn PDF document text
    • http://eko-uklid.com/files/file/11771822113.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/18523320740.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/41532688153.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1614533cb6ee59---jokitudofinabelami.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/nojadibafiduvobovene.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/21137496133.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20faa9e99---dasojesokemuremogex.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130006edcdca---kukizopa.pdfIn PDF document text
    • http://orderkai.com/uploads/files/ziduxoranazezez.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/79564613151.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 10428 bytes
SHA-256: 48990cd5455c9a2d6b75b51416665b474cc59ddae7615078ecb4cb31909d739c
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 21304 bytes
SHA-256: 75292155c8cac369a6f99ed6814f1a7bf1e4bc565cacbf3150a530d957c2a9bb

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