Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ceeadbd465d027…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 13:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02528afaff79feef973a29dd8b12725c SHA-1: a833ede20a742ef98157c662757eb9fe485c6011 SHA-256: a8ceeadbd465d02722aac2a4e6e69b951fa86bd22d237e66c9b20f041dfed85f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript and the link farm structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c765973129fa31101704dd0cbf8d2ee7/62803591909.pdf In PDF document text
    • http://ancient-theater.gr/media/file/90331910642.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/6055f5.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a13967a90---karisus.pdfIn PDF document text
    • https://austarpharma.com/upload/files/73268087712.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/88293053643.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/bupadabasug.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/39321742622.pdfIn PDF document text
    • http://philboyd.com/10827136660.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161557cc67ab19---zawufadamidabefasi.pdfIn PDF document text
    • http://recrute.fr/files/files/fedejiwanoteputewime.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a9c65c33---mawanuvotarupow.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/kozebupulivek.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334afa24c6d---zajoviw.pdfIn PDF document text
    • http://clickvay.com/upload/files/rewepefogir.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/53175908253.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/76597993745.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/sikozofebeg.pdfIn PDF document text
    • http://melabo.com/upload/files/95139717121.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/81451879060.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4b7b5010f0b6334207d54155d055bab8/xizuvesadositedimox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+download+pokemon+x+on+androidPDF 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_off0000b0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BF 10656 bytes
SHA-256: 13bdf878f2540a357c5bf96e5bf4e22a2c1515e5e6fd2858e9109293366baa1b
font_01_sfnt_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 15900 bytes
SHA-256: 42635f1bf1c0ecac17f705a8d1103e9a7f29cf045a65c50345e26abeee0de392
font_02_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1