Malicious PDF — malware analysis report

Static analysis result for SHA-256 38616ade8c18f98b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 15:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f4482317af53a00b828fc71312d9dd3 SHA-1: 2c91e3b90be6df551f49020365a401d07e5cca13 SHA-256: 38616ade8c18f98bb3bde2b6961659c14bf50a1508111eda9075d15a2d51c4a4
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information, likely by impersonating a legitimate process like digital signature setup. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://drafthe.ru/uplcv?utm_term=adobe+pdf+digital+signature+setup PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/4d6f907f49134faaf3058287967d1f82/pejin.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/6ce4bc45e32e020229e64d813bb1409e/pazewevukunesijiv.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b254fd2f74c---62955101269.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498fbb2093---xesobala.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/kuwigitovoduvupasonib.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/69860885776.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e0402bcc---fuxomegugufuvosuvizupeduk.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795483d0362---dajowesozirawibujobesiv.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/75334306672.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/rokuvesifexefosod.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/powamikutina.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/30142017973.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/89474966970.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/31041265207.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde68ee304---tudobi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061905433073499.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160750285cf760---kufilomisibokafezamobeze.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/paxigirajutekuwevuzap.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fd4dadf8602cf0bfd951736e9a11937c/44086245809.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c2cc057e---35994180626.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210710112502.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ca5b4e4c---xobololude.pdfIn PDF document text
    • http://handgun.ee/media/file/rowonibelavufuda.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/81940912969.pdfIn PDF document text
    • http://paliukenas.lt/i/File/japokod.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b702b6b5e4e---gusawapojonujagisuxok.pdfIn PDF document text
    • 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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10896 bytes
SHA-256: 9a7ef0b6ffceb6bf7bcf8c0eca0a9895ddb5bde2f2bb3062e3cfe9aa4126f610
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16976 bytes
SHA-256: 970764496d2b71216997cbd40f5ecfd74c7197ab83a08f5d299432378041589a

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