Malicious PDF — malware analysis report

Static analysis result for SHA-256 7777d4d54efe0416…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 00:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d48470786fbfd70ac5a92b861130a25c SHA-1: 1943a4c7633d5648f57e4f449cad552995791c38 SHA-256: 7777d4d54efe04167ce4d45460d2382c9fefdb2832e8bcfc329bcb1776e0c71a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jkgnf97qop89l7k8818o9nlrg2/mexezaliket.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941b0242c53---pudifuzopaloxatow.pdf
    • http://travelci.ru/ckfinder/userfiles/files/xuxidotopisogoxe.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4aa99a46a3---jubuzagizemug.pdf
    • http://aloeverajuice.cz/files/file/49482730179.pdf
    • http://studiosiciliani.eu/userfiles/files/suronobinaburuzixupiviteb.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hf0qudkdr7cnh7mthdp7ej01i0/gerojezibizisiroposevito.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/donupeboxaduz.pdf
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f86c21939bb---97787524014.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3c814d75---jejotozarosakapev.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1c71705ea---bajepobiwe.pdf
    • https://hyosungulf.com/uploads/file/dumugubegobopoperovape.pdf
    • http://vladekoservis.ru/files/55907502420.pdf
    • https://atphp.ch/userfiles/file/19370242365.pdf
    • http://vendingchat.ru/uploads/ckfinder/files/62589074182.pdf
    • https://ancoraeducacion.com/images/pubupirefezavuposegu.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d1e705c292b48048a534efeb678ab449/nulinusolawerad.pdf
    • http://notarbrazda.cz/userfiles/file/kezenikoratibepegeraxo.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085bad3754c6---46644728178.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeab2a158d---gugonopituzamofunulesif.pdf
    • http://theloanwala.com/userfiles/file/xasazebobafopasefe.pdf
    • http://artospace.com/pics/file/wefezadarurirumu.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ut6fr2mk0nf78qfcjksi1n8941/14527112897.pdf
    • https://turdv.ru/SITE/files/editor/file/juxaxemavexilel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=letter+m+practice+worksheets
    • 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_off0000d504.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 16792 bytes
font_01_sfnt_off0000ed1b.bin
402a035444f99cd2b873dfcacfd422b635fef119f4b0f3aa0c3b96596c6f498a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10624 bytes
font_02_sfnt_off00010584.bin
029e2d473b68610b5ba874af9f72ea86f1ad7307739c83bf1189e1ebe5ae82db
pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16996 bytes