Malicious PDF — malware analysis report

Static analysis result for SHA-256 2272bd4e3a38be37…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 06:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e97688c13fef986401f1d88cd063446 SHA-1: 31791c3092d6a3fa66d9e2b7e3467812ac64f673 SHA-256: 2272bd4e3a38be376bfbee1815feb18c34096b3ac1b52d2defc37904ce4090d0
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=b+tech+malayalam+full+movie+tamilrockers PDF link annotation
    • https://horkolas-gatlas.hu/ufiles/file/26152357282.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/94620376846.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/62807248879.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/58812288661.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613df4062a343---54943408917.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/99006227781.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/31851845221.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/87892459485.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea6d6021f---petawupifaxusedezuw.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/68355655407.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/dinojofaropovadidinineviz.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/nivonudubiwalig.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/mujalajaxan.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/8375063092.pdfIn PDF document text
    • http://safarang.com/basefile/files/tabezarumatasesozakedup.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/zilisilevosisik.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161354607d968a---60732945526.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/98563835171.pdfIn PDF document text
    • http://usateatop.com/_upload/files/36223938170.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/51262570778.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/36043948097.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/1353712123.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/lonalojuvotigibe.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/tegeduwot.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/23105070880.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/zedufazejalisawanijatago.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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 17000 bytes
SHA-256: 74280aa7da7c4a6e4a1351b577d879e116a2db9ae7b4915f42013e88c6e44935
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 10920 bytes
SHA-256: 509033755ef60a797ccffc8e6fdbb5e2234a606b178a7e529704aec3dc0a77c6

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