Malicious PDF — malware analysis report

Static analysis result for SHA-256 252d00e97590a2c3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-05 09:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 72c092925ffbe081c928338d5c545afd SHA-1: e04260c5566093705f195fd02edd36c7d25a8146 SHA-256: 252d00e97590a2c34677a963a9685d5fd06bf97743530e9e8d36341b2399324c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The primary function appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agavietnam.com/img/files/6551831099.pdf In PDF document text
    • http://polipack.ru/content/file/seretepotexezizikaxuf.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/65987933659.pdfIn PDF document text
    • http://texmet.pl/userimages/file/98676746224.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/73509849598.pdfIn PDF document text
    • https://mmszke.hu/files/file/11284099038.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/muvapenibarefagoxipotiv.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6740e523---34473259209.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a868ca8d1b6---fivunewakiw.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718980d9b39---59827993850.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/jinafafolavej.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/piwujom.pdfIn PDF document text
    • https://afayl.com/userfiles/file/savibux.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160827f7e07f55---24607274546.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/jinaxove.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/55043133049.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/59465644925.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32918e3909---javixaru.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/jagagodero.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/75577375507.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e0d484c6877fb89041260935860e0f80/loruwamiloxabetajaposi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608999ff65c4c---xazub.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624000058.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb7b3e2a7---76063194708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=addition+and+subtraction+word+problems+worksheets+grade+2PDF 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_off0000b6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6ED 15304 bytes
SHA-256: 3f3072b2d18c147d250972751400664c876fa5bcaa6a3296c0692d1cc2a219c0
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 11480 bytes
SHA-256: 3dd76af56b79b091fa5e3ef4c92b96de98396d70c1c0c7fb8a8fe3e1117340de

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