Malicious PDF — malware analysis report

Static analysis result for SHA-256 a202322b661bbc04…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 17:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f6ca9314f0d270b6c03bbee917b9ab3 SHA-1: 5f9feb2e180b10ce39b0dce27ff323bbefafea4f SHA-256: a202322b661bbc047525d577eeb2a13a33a4a2621616c858def10c1678f49b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=academic+performance+research+pdf PDF link annotation
    • http://ponyomaru.com/files/files/zapurowaro.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/mojafovedolo.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b86e5c23c---dasikefoladozotewu.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/42724377057.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8d01c9f2---zemiritunonutalugibuwez.pdfIn PDF document text
    • https://eclearusa.com/images/file/vevozomazabawemomepubopod.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kisoz.pdfIn PDF document text
    • http://bscartridge.com/pic/nolepo.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/jididuzutawum.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/23af74e397c9221c8fc449a3524001be/50880158675.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b799c6be01275267ee17aa4ba154b27a/gemopixapusefozos.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/82070024646.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/33053449564.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16269887768192.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/bejigesakidiwupadegi.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/dagokix.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11d72801a---99631008230.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/lawelevutovule.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fevelujetufobasitigefenaf.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17fa6de688---monojuderoguxupixikita.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_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 20036 bytes
SHA-256: 22ab0b5b431199daf732c125a12c623eda47fbd9102c0fffaad456e07df875df
font_01_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 10724 bytes
SHA-256: e84c11b2b478b073dfc5f73fdd7ef6cf9c724d56083baac9c25379265594e890
font_02_sfnt_off000138cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1