Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d02647216a526e…

MALICIOUS

PDF

93.1 KB Created: 2021-08-01 02:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01052ed20e45c3027798696fc46e0b28 SHA-1: 7bf52e9d9b8b90a9b1f9498fe9e774ba906bd192 SHA-256: 78d02647216a526e3eff979aee757989501240a8474efbd12c53320e6359e2b1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable hosting further supports a malicious intent. No scripts were extracted, but the overall pattern suggests a downloader or credential harvesting lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://spprp.pl/userfiles/file/mexusevudefoderomuvepifo.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068c225fb1---latuvizigepunigimifuf.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e5fe0733887b57eecec57b309e611a3a/nevexul.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m4hn0v4e8jjqurcefkca0dmchl/libukageweraramozifa.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607565b6ed60a---dojobalilugup.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/winadegekedeka.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/75361c815ad23be0bb8c3ccadfeb8955/gabozogiwagafeviduporov.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160716eee11b74---94624554452.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d09dc16e8---golir.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/960b7c0dc03149357e22bfd75fad2205/13197669346.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/jakarowuw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7j3thsseinb43n0efqumesmtu/konikekefixerusezavunele.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea1cc303283a3d5a848a15ae2378b5ac/52116313377.pdfIn PDF document text
    • https://primer-spb.ru/files/files/2328042682.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/dekebak.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///nikarugojavasetinoti.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/nrjl83dsouku3heq54i1srd9jq/88875325053.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608742a0450f1---kivaxaw.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98506ac9f---2248116367.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/xedakotaginugigegelif.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc196e4c9---61901492813.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/92053157825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fernando+pessoa+guardador+de+rebanhos+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980f7e99e5c---gufazawugitadobi.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_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 19852 bytes
SHA-256: a70f932b9fa55eb096fd04fb432e27d8de81d3229fcde0c10988a03524ae9f83
font_01_sfnt_off0001341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C34 10760 bytes
SHA-256: 42c14502853926793899147b96c8f47cef506895e958ce3229cefcecbaa69435

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