Malicious PDF — malware analysis report

Static analysis result for SHA-256 4229ed7234a56ea8…

MALICIOUS

PDF

66.5 KB Created: 2021-09-07 00:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5f490f9a8f66e9ac7c11d016027acd8 SHA-1: 382981749c5a630ee339a77ec25e87990b2bc8a7 SHA-256: 4229ed7234a56ea80d3db5be5c3a5efedd6f2fe3c0b0a8bfa63ee90b25ddfb2f
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6525

Heuristics 5

  • 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
  • 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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6de91fd307a59f37a76756aaebfdd520/19728695405.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6f931214a---97492558332.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/88882030106.pdfIn PDF document text
    • https://bselink.com/userfiles/file/91864167525.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/42110160397.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/webubuzabolefaleparuvokov.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/xasolomoburofagaxikalazel.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/af551dbf74f403675f1221500e37ca9c/38801535476.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/20482273894.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/5969543057.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d920c4c1---xetupu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ba683f0d6ad---tavagap.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610141098c5a3---vowigefumoj.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a30180c8d---zakuz.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/kolutikirem.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/podufafikawa.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c2d35f49---sowumubo.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/disiwenufezodusepiwido.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c44bb6b9dd6---10430967813.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zodofisusuli.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/98e1cc4930f6d9b4ab26622312107143/77421037603.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/1t1h4a4ee4iml7pp4gso4sgpq5/75424272216.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7si3e7p6tal0ugqgsb18g3vf4s/16401753388.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/sineruniwarivoxagek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+resueltos+numeros+racionales+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA15 10992 bytes
SHA-256: 6fb33a439af99d317fd066858e2262c7ba5a887eff8508ba0650ba11443c228e
font_01_sfnt_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 18012 bytes
SHA-256: 42244217f6170b10e058a2c22937109d9308332cf1242af4fbed00147a3cb949