Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeacbd8f6db7ad1a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 16:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d5e45d267a42ffb6080ac37fa3e6744 SHA-1: bd75a3aa0a5d8e1a35242f3eb9195fbb7884dbc1 SHA-256: aeacbd8f6db7ad1a7792d60d21f14b269c3e9a62ee8d21f8ccf10e8a50c6ed1f
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, flagging it as a link farm hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous external URIs, many pointing to compromised WordPress sites, suggests the primary purpose is to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://dok-vo.ru/userfiles/file/19787380267.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f6e26f90a36b190e0f07863a4219eccd/63158746002.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/mebelurojugupixo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0899b3420bb0fa52288650be5a588284/36216298137.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/virosefifomolitule.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/dirabotemomu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ae714c63---13145380834.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3220d42f2---davatoxuvirojit.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/73613789316.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/92052687445.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/89334323712.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077458d02ae1---51713334011.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/itkb9n1dmgr9r1a11n77isfnl3/mobuwoxizekowovu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d927fb35de2---62492519188.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/18341465621.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e8cf54b13c357b229d787056d99490b2/xekorefilasudokafe.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/66834146316.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9clkl28p32a428rhqpm31d9ftl/19394706703.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/puvokasexosulotubo.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/52452952420.pdfIn PDF document text
    • https://2acontractor.it/images/file/loferelepa.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/solasavisi.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/masofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=farm+animal+sounds+worksheetPDF 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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 17788 bytes
SHA-256: 4ac9ff701f94cf52544658f39f49cbffefa2fe33233612703943b50026cfde9a
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 10768 bytes
SHA-256: a0e22817e0d9733947f6512d212044311458dc0925ab078587d7154adf754fad

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