Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf231d6d9c8f5e33…

MALICIOUS

PDF

87.6 KB Created: 2021-06-25 21:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b36829537fb095369e15344f5408618b SHA-1: 299147fb33e5b49d0c8465ff5225655258719be2 SHA-256: bf231d6d9c8f5e339a8743e62e0f468572d4083898498950c9d5461893074ddc
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ba53b799219f97aa53acccaaca92ce0c/sofonujogesif.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/16d9fe7ac12cf10f0ff256d962e64a15/83614933565.pdf
    • http://web68s.com/upload/files/43541486514.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc51fe4cad---25540204187.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ben92372a73q45d970qiddde22/mowoxifexisafadereboreto.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c33e66a0c---xuvavafinavevowumirimuviw.pdf
    • http://duhochmis.com/files/uploaded/files/lexisuneledezoga.pdf
    • http://musorcentrum.hu/files/article/file/ritotabununurusep.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce910ee5c4---lesojadibolidisorikolamaj.pdf
    • https://airflow-skateboards.com/upload/file/zetofejezefivudodago.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c967cfd95---61300759525.pdf
    • http://scro.ru/pic/file/wotiwejagupemorejemane.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a48c6a78de9c06a2c61dcf00d36367a7/gosibisefejakebil.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c43c86eee---23827201853.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/gugepiradulezunu.pdf
    • http://pc75.net/upfiles/file/1622482341.pdf
    • http://ampletrekking.com/userfiles/file/19489148587.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085e939d5e43---lotobezoxekugorepi.pdf
    • https://advantagelic.com/singhania/downloads/file/najesowepadimisaseroworoz.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2fe2108cb92660bba6987195113683ed/vajekize.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/iprtj9amk2kcaj73457k55a28h/xukiwasexo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+engineering+of+consent+edward+bernays+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_off0000f1ad.bin
b19bfa9126e9f67fe89f2413c478c7276fa8d6821898f47633f05d6ae023b903
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 17380 bytes
font_01_sfnt_off00011eec.bin
902c4c057ee837c7dd2923cad3a4a2adf43723f9576432015628e44eeb32f0df
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 11156 bytes
font_02_sfnt_off000138a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A0 16792 bytes