Malicious PDF — malware analysis report

Static analysis result for SHA-256 38deca12bd3e7404…

MALICIOUS

PDF

78.3 KB Created: 2021-06-25 18:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c0fa63bb3c1055b4acdb1241865172b SHA-1: d2a727c57598b57860e9e11cb4f295a2b1931be6 SHA-256: 38deca12bd3e74043059bba29d969dd51d0c7f43da618841be7effa414cae3f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/k9bupa1u5543n96icoqlg6r5dn/mufudijez.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986086c37c6---sixusavelozaled.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fdfa50c07---4377693806.pdf
    • https://red-adlay.com/upload/files/17169475894.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/72dbbdc1bb69f1068dc61385f1917459/porezikijetufozakuvuv.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b61bc13cf---93860985603.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5f6df6c7---zojedawasadipuxe.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cd5e9b8ca32f75a981e7eea6858a76ec/40298581009.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vk9pejdoqvp6o8ks81b0n8a9b0/parurupavivebonosup.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7u15h77mqfe8417t611ua563o6/11356024842.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e17936742451ccdadfc49e83ad1e5792/pasub.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5f1894178b8ae0fa9b38ef8289ec6d4c/88571787162.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e7051d2e879dff248ea9a6559e7d5196/72382547607.pdf
    • http://speaklifeiamgreatness.com/files/files/48887324542.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/387d38bf0be21e03074e4fed70d88aa5/32051908883.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c55a9712f2ea46cf12d869fc39aafed7/bifepaluwijolufutag.pdf
    • http://merwepizza.com/upload/file/denowegif.pdf
    • https://agrilaui.com/userfiles/file/15906400368.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/53399693440.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j49u72nmevror7fui8c0th8q59/molipasotawepufeg.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6b205f7ae87afc9e9e03d5256613227f/tusaduwunomozomavesojulox.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/nulosawomejivukanasagigot.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e8196b5de---geribirunepinolabera.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fisheries+business+plan
    • 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_off0000cfe6.bin
8a8a84c23f25082d6f318b9f5be0204ba8af692b4dfe687a675554fb988ab11a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 10348 bytes
font_01_sfnt_off0000e6e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 16792 bytes
font_02_sfnt_off0000fef2.bin
70b3df042e6bc7efadc17b5385f6a24360155cb52a553e56756f7ced6372f142
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 17988 bytes