Malicious PDF — malware analysis report

Static analysis result for SHA-256 d572c9749c2affbd…

MALICIOUS

PDF

71.0 KB Created: 2021-09-03 00:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 473713e0e9271d98acb2d9bb42d51eff SHA-1: c26a747be0cd1eb8e0ae5367750b813a106ecaf3 SHA-256: d572c9749c2affbd36d53edd1de047b8e2a5f0e755af43138b3fdcd05b029e13
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, particularly those hosted on compromised sites, are key indicators of the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e99be03a2---62556306623.pdf In PDF document text
    • http://elcolono.net/userfiles/files/47378617521.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8d21817ea97ab07e26efef4c9a2f8ce/wareja.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vatagenejepidubepufip.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/13999880098.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mibemodizok.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/oglnfnie7i6fp3693b5t2k5ih7/boxiwatugidevanusi.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nujexokixaxekolorafapepo.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/97665944061.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/92173184103.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/zabalixirerafu.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/gegedagubefabo.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/27591840071.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5575d0d51---3528650697.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160823678419a2---90585222337.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/faxopogagedol.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884d4ac7472---lelujadopiridujufuf.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16098355a11a2f---wixapoxinojafid.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/86891354499.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/k3v6urlogghb3m9vcllq1p17nh/50968736864.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/xuvuzado.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/nugexefikupanurev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=muscular+system+worksheet+middle+school+pdfPDF 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_off0000b6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 14756 bytes
SHA-256: ec6c6d0086164715917e60ae1844c37d577cec8fdbe07acb94be43c55ce263b6
font_01_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 11164 bytes
SHA-256: 5e93388cabafcacfba1ce4bce044ba90f0961cf98862836f1533a44c620880b4
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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