Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3dad6c5205546f…

MALICIOUS

PDF

87.6 KB Created: 2021-07-30 05:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a10140c590ae4d4c2a4d3159f2aa315 SHA-1: 6ba1923e43c4b225f4deaa6902fb5e2506b7b4e3 SHA-256: aa3dad6c5205546f4c3705c114d5b24135ed847b98d4702ff388ff1434afc53b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or SEO poisoning attack. While no scripts were directly extracted, the nature of the links and the detection indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8587174a7fe391926eba8c0d59dce9a9/wivovemibidubaku.pdf In PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/lematefuzadogabetun.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833b54db2b4---lusakunulatoxeji.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/tidokaj.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/63vug1k8dfkms5s4pncqtj71k5/78743176499.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb1de433---xosuge.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff47fc7f49---pudefoxifamolub.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a19f9038df59b38f01206ebb2592410b/95031438737.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/jupabumovazoferijig.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8ed521f79b6493852def504052de8061/58248108341.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sagiwewik.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe81a64273---wujamerurijo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddda1446fb---47491112202.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160832a0f62f1b---91810949719.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/demedi.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/juvesejijezolo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c741456f1---82155925835.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af9a38f8a---tugulepod.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tr86q2umfteqrtn8tia1rns0e5/vulojelif.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/670379d41f48370a56b170dc86908145/29575839771.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fidewaseralef.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/56862ae9c4ebfee4523dbd2653f42b21/labupotevepuda.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/d823efbcdd6c847da2009394fa19ba94/66505654614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kingroot+apk+2020+android+10PDF 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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 10600 bytes
SHA-256: 02c1437425e706ba8e83c5a38d8566136ea0b3a2784834fe623be22d2e6196da
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 17944 bytes
SHA-256: 80f164a32c6c9b3db76bbfe92c0c5663ba66bb128a491c7f7df2c974760d3b1f

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