Malicious PDF — malware analysis report

Static analysis result for SHA-256 a352f961b732383e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 05:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 397dd6d7778a9710eac8d31bdbb2342b SHA-1: 48311af561b0719318114c61cf820721f69d30f9 SHA-256: a352f961b732383e7ba3583888384e6afeeecac228bad7958ea85af371809432
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites or disposable hosting, likely serving as a distribution point for further malicious payloads. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://infrive.ru/uplcv?utm_term=lotto+apk+download PDF link annotation
    • http://computer-rudolstadt.de/upload/file/42940802312.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/22336816664.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/34164590366.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/51b7c42de399ece632ee7391a6de6f87/4875700792.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d6703bb5---puzejaxefe.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/53102205223.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f654e84330---81367513123.pdfIn PDF document text
    • https://norservis.info/files/files/21179084984.pdfIn PDF document text
    • http://koddous.com/userfiles/file/10704180735.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/ruwonugizoma.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2933308490.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vakojiza.pdfIn PDF document text
    • http://vinmexindia.com/uploads/redotokerep.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4942c2b6---rafofuvelerami.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1630d0a49---sunukuxodese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686c0893d7---dijovutabiku.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/17543936930.pdfIn PDF document text
    • http://workontext.ru/media/file/tojipasopaxasik.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/72561084154.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/23210882834.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/80801862685.pdfIn PDF document text
    • http://net-work.cz/data/file/49965909499.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/gapajumedejuwewigados.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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 18576 bytes
SHA-256: f9173e40eb1df57f218e2092e139681870a67584eaef58131200d2659ee7481e
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 10028 bytes
SHA-256: 2df326948a211572ee46cac01b8f6d08d7359f08f8ae73c6924c6ab2c36788c3
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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