Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e7fcc8dde00331…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 05:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 680714a82d7f38656ca4dff413b8b8b3 SHA-1: 6aac0450d99134cbee9932bb2de6997f4f685508 SHA-256: 62e7fcc8dde003312f0cc84c3ca3b9cc689e0f103ea9d6cdf44c85ac9cef0201
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms on potentially compromised or disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=how+to+clean+the+memory+of+my+phone
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/sarukukoxugotupedogore.pdf
    • http://qqwandai.com/uploadfile/file/37531183350.pdf
    • http://gsmontaggi.it/userfiles/files/kuvokulotugujonuxedir.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137e8cbc071a---87369792171.pdf
    • https://mercerapparelss.com/userfiles/files/85952820329.pdf
    • http://fecoil.com/userfiles/file/bizituxufimibunirise.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/fazixalabagonugago.pdf
    • https://haisanquangninh.org/data/dulieu/files/fomutuwufidixukamubod.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/tewegazosafilo.pdf
    • http://dreamsurgerycn.com/ckupload/files/17919973074.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc7347b00---88727624219.pdf
    • http://first-group.kr/ckupload/files/fadovitujakugulubumipuwok.pdf
    • http://presssimayeshahr.ir/pic/file/pexelupixiziropixuv.pdf
    • http://mathrainbow.com/userfiles/file/74281534989.pdf
    • https://manualismedicina.hu/fileok/file/75258500226.pdf
    • http://oasishs.com/uploads/files/20210913_185642.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/7211924766.pdf
    • https://vasantviharproperties.com/userfiles/file/nusotedobet.pdf
    • http://surmounttravel.com/userfiles/files/xokogozewit.pdf
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/lebabogune.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/381d564ff97c63743927aaaf10bd4528/natav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13c.bin
c7e8149743cd0f1cc5d5c9f95565f340d90714e6e9d95d13fce6e0323779dc35
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10676 bytes
font_01_sfnt_off00010988.bin
d3fb366d8bbc4020f62d48e151939dca8ad6b937b0bce4c2bef1b0089158544a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 18440 bytes
font_02_sfnt_off0001391d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1391D 16792 bytes