Malicious PDF — malware analysis report

Static analysis result for SHA-256 e550cd84b0143524…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 06:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a124894bd4c07abaacf7564a9d7081ff SHA-1: 968559737d2fbb375386b4a2911980e4216d7c17 SHA-256: e550cd84b0143524f7fcceeef444fd06c0db4bc31840ddbcd5e4d8ca773253ea
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links to compromised websites and a heuristic firing for a 'download button' lure suggests a phishing or social engineering attack. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall pattern points to a malicious PDF designed to trick users into visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=gta+5+original+obb+file+download PDF link annotation
    • https://internationalmedia.com/userfiles/file/titusi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/41339869497.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/fodot.pdfIn PDF document text
    • http://attlas.center/userfiles/file/67766000892.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/karafin.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/5180914237.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/42653259227.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/18114628557.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tokuweroguzozaboviden.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/bugomopatalov.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/26815757246.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/bixawafunotazukexetoxujid.pdfIn PDF document text
    • https://olterus.com/contents/files/12624436774.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/woxilofajajivejegefivupig.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/47410883778.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/25515358232.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/wiraketumibiso.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/10495391471.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a0lr3f0lk4piop7p8j1f5h1pqa/xodaweze.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/16754738326.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/fanawusebilezipawis.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3ca8e24c95275551f048ea3f7cfe0135/xugisotuxamigiju.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613901ba7a9d1---jivupeturuxugututodo.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/taxufizagijusabepile.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8aa9a6c66---91443091384.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_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 10760 bytes
SHA-256: d7d72682aa287afcd850ffbb81d501a804e3e2208783db4ccd11b1f80a80463e
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16936 bytes
SHA-256: 6db8a35c7d01df780c1dc0fd3ca9262a48d55b7b9525a62523910eaee590aa3a
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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