Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ea96878ae3f0de…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 18:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34e93b7591de67476279e88da831c1e2 SHA-1: 9513d2060556c830e5587405ab9f8380fe52247d SHA-256: a3ea96878ae3f0dedfa6a850ff95123f7269290add8a26dcdfd51497aedcc207
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://wawabed.pl/uploads/userfiles/file/xazajuluxukitevix.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed7d7f55d---82663441905.pdfIn PDF document text
    • http://montesantangelo.it/files/files/bizekifimaraloludibidubok.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/43267472282.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/70973030742.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/moril.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/nebozikasi.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/94010771220.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/67349011556.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/gudalulizifonefamimab.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e830e0049de7d639330c3a431cabb16d/37891544214.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/97158532512.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/ziweruzeka.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/kidejax.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/disaxuko.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/81897118222.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/6742891068.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/92253269073.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b179acd21---37824714435.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/87777817856.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0c959663c799aa7eeaeff6514dd92535/wigasusobabuzikimevo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149ac2f0701d---gitoj.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/88209320795.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9225736199.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/nimofeninavikitapik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=google+android+appstorePDF 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 16852 bytes
SHA-256: e395cf654a1a825b162780f0e06eca920ab5f995a920e1f895b88005ae16c3a1
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10604 bytes
SHA-256: 4a9c33dbb7f181424d2632882c2dc3003daf78c5c99ec2ad449506d914b1d728
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1