Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaef6acf014a76ee…

MALICIOUS

PDF

92.2 KB Created: 2021-06-30 00:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c932dfa091d917af5465a94313f9fc11 SHA-1: e7b1dd08ef23c622ef18a4a655890b4bb84d638d SHA-256: aaef6acf014a76ee0379d29fc2ae52dcfad68f0240ec335bfd1af28628fe1474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The link farm structure suggests an attempt to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840830af256---33906231869.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3bd0b3121---dikitakuredopijasepax.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dfbc2d68---96882185336.pdf
    • http://feynburg-uhren.de/uploads/55239539421.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2809de877---12405196450.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3dd68236---giwuzorixenevitap.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160800be39839c---bomarabigop.pdf
    • https://brianhigbielaw.com/UserFiles/file/zuvotifenorog.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/kelejidit.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b4b1feae---98014288707.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6736485455ee1853d18f1e6f599e2489/59978300504.pdf
    • https://ktmcollege.org/public_html/userfiles/file/gejomanijuzugur.pdf
    • http://zzliuxue.com/upfile/file///62154552227.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/6781884672.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/71ccd237dd1b21c09dd0909eda0311c3/72248687477.pdf
    • http://driver-jazda.pl/upload/file/99215246393.pdf
    • https://szekszardportal.hu/userfiles/file/mutosovagugurofone.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5c1d4eeeb0bbb962dfb36b95284e01c8/35259816955.pdf
    • http://www.medicellbank.com/userfiles/files/17005622117.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1550cf96---69526971382.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/gevibodibose.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23a2db2e3---80064143184.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3fda794cf35eab7bf429e7d3dcd5ed83/bubakixu.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/lujadalanita.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=animals+in+zoos+pros+and+cons
    • 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_off00010508.bin
e152757f38532a44724717534ae188840d31e49935420d7e4561c6813f2358a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 10484 bytes
font_01_sfnt_off00011cd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16792 bytes
font_02_sfnt_off000134e4.bin
85ac273e9a0e51915466ee8c4985dd78e9a6636ab729d68cb15cfca057228cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 17448 bytes